Nice review, a bit harsh on the lack or RTC (I hate pokemon by the way so it's "loss" (it can be patched ) is nothing to worry about).
Edit: 256 GBA games apparently work the same way the EZ3 does:
http://www.sosuke.com/ezflash/viewtopic.php?t=883
for those to lazy to follow the link (it is actually the discussion of this very topic):
As for a list of 256mbit GBA titles (Costello's list seems to have included a few overdumps):
A copy and paste from:
http://www.retrocovers.com/advanscene/ (click advanced search select gba release list, select search for: size and type 256 in the box on the right hand side, hit search and you are away), or if you use Offline list you should just be able to select it in a box.
2375 Double Pack - Sonic Battle + Sonic Advance Plus Japan Flash v133 - 512 kbit 256 Mbit
2374 Double Pack - Sonic Pinball Party + Sonic Battle Japan Flash v133 - 512 kbit 256 Mbit
2367 GBA Video - Cartoon Network Collection - Edition Premium France None 256 Mbit
2351 Mother 3 Japan Flash v131 - 512 kbit 256 Mbit
2341 Crayon Shin chan - Densetsu wo Yobu Omake no Miyako Shockgaan Japan Eeprom v126 - 64 kbit 256 Mbit
2322 Yggdra Union Japan Eeprom v126 - 64 kbit 256 Mbit
2320 Yu-Gi-Oh! Ultimate Masters 2006 Europe Sram v103 - 256 kbit 256 Mbit
2317 Yu-Gi-Oh! Ultimate Masters 2006 USA Sram v103 - 256 kbit 256 Mbit
2315 Yu-Gi-Oh! Double Pack Europe Sram v102 - 256 kbit 256 Mbit
2299 2 Disney Games - Disney Sports Skateboarding + Football Europe Sram v113 - 256 kbit 256 Mbit
2296 Yu-Gi-Oh! Duel Monsters Expert 2006 Japan Sram v103 - 256 kbit 256 Mbit
2286 Double Game - Cartoon Network Block Party + Speedway Europe None 256 Mbit
2277 Yu-Gi-Oh! GX - Duel Academy USA Sram v113 - 256 kbit 256 Mbit
2249 Summon Night Craft Sword Monogatari - Hajimari no Ishi Japan Eeprom v126 - 64 kbit 256 Mbit
2233 Shamu's Deep Sea Adventures USA Eeprom v126 - 4 kbit 256 Mbit
2215 Pokemon Fushigi no Dungeon - Aka no Kyuujotai Japan Flash v131 - 512kbit 256 Mbit
2205 2 Games in 1 - Sonic Advance + Sonic Battle Europe Flash v133 - 512kbit 256 Mbit
2204 2 Games in 1 - Sonic Pinpall + Sonic Battle Europe Flash v133 - 512kbit 256 Mbit
2200 Harry Potter and the Goblet of Fire USA Eeprom v126 - 4 kbit 256 Mbit
2193 Fire Emblem - The Sacred Stones Europe Sram v103 - 256 kbit 256 Mbit
2183 The Sims 2 USA Flash v131 - 512kbit 256 Mbit
2174 Crash Superpack - N-Tranced + Nitro Kart USA Eeprom v122 - 64 kbit 256 Mbit
2164 Crash & Spyro - Super Pack Volume 3 Europe Eeprom v126 - 64 kbit 256 Mbit
2160 GBA Video - Cartoon Network Collection - Special Edition USA None 256 Mbit
2155 Horse & Pony - Let`s Ride 2 Europe Eeprom v124 - 64 kbit 256 Mbit
2153 Yu-Gi-Oh! Duel Monsters Gx - Mezase Duel King! Japan Sram v113 - 256 kbit 256 Mbit
2099 Wagamama - Fairy Milmo de Pon! DokiDoki Memorial Japan Sram v113 - 256 kbit 256 Mbit
2078 2 Games in 1 - Spider-Man + Spider-Man 2 Europe Eeprom v125 - 4 kbit 256 Mbit
2059 Steel Empire Europe Eeprom v124 - 4 kbit 256 Mbit
2042 Bleach Advance Japan Flash v131 - 512kbit 256 Mbit
2018 Riviera - The Promised Land USA Sram v103 - 256 kbit 256 Mbit
2012 Kouchu Ouja - Mushi King Japan Sram v113 - 256 kbit 256 Mbit
1974 GBA Video - Cartoon Network Collection - Limited Edition USA None 256 Mbit
1968 Kingdom Hearts - Chain of Memories Europe Sram v103 - 256 kbit 256 Mbit
1967 GBA Video - The Proud Family - Volume 1 USA None 256 Mbit
1948 GBA Video - Super Robot Monkey Team - Volume 1 USA None 256 Mbit
1946 GBA Video - Disney Channel Collection - Volume 1 USA None 256 Mbit
1945 GBA Video - Cartoon Network Collection - Platinum Edition USA None 256 Mbit
1944 GBA Video - Spongebob Squarepants - Volume 3 USA None 256 Mbit
1926 Maya The Bee - Sweet Gold Europe Eeprom v124 - 4 kbit 256 Mbit
1806 Kingdom Hearts - Chain of Memories USA Sram v103 - 256 kbit 256 Mbit
1792 Cinnamon - Yume no Daibouken Japan Eeprom v124 - 4 kbit 256 Mbit
1790 The Urbz - Sims in the City Japan Flash v131 - 512kbit 256 Mbit
1743 Kingdom Hearts - Chain of Memories Japan Sram v103 - 256 kbit 256 Mbit
1738 Pferd & Pony - Mein Pferdehof Europe Eeprom v124 - 64 kbit 256 Mbit
1735 The Urbz - Sims in the City USA Flash v131 - 512kbit 256 Mbit
1711 Ochainuken Kururin Japan Eeprom v124 - 64 kbit 256 Mbit
1690 GBA Video - Cartoon Network Collection - Volume 2 USA None 256 Mbit
1668 GBA Video - Nicktoons Collection - Volume 2 USA None 256 Mbit
1665 GBA Video - Pokemon - Volume 4 USA None 256 Mbit
1664 GBA Video - Pokemon - Volume 3 USA None 256 Mbit
1632 GBA Video - Dragon Ball GT - Volume 1 USA None 256 Mbit
1564 GBA Video - Yu-Gi-Oh! - Yugi vs. Joey - Volume 1 USA None 256 Mbit
1560 GBA Video - Teenage Mutant Ninja Turtles - Volume 1 USA None 256 Mbit
1546 GBA Video - The Adventures of Jimmy Neutron Boy Genius - Volume 1 USA None 256 Mbit
1543 GBA Video - Nicktoon's Collection - Volume 1 USA None 256 Mbit
1540 GBA Video - Codename Kids Next Door - Volume 1 USA None 256 Mbit
1539 GBA Video - Cartoon Network Collection - Volume 1 USA None 256 Mbit
1532 GBA Video - Pokemon - Volume 1 USA None 256 Mbit
1531 GBA Video - Pokemon - Volume 2 USA None 256 Mbit
1506 GBA Video - All Grown Up - Volume 1 USA None 256 Mbit
1504 GBA Video - The Fairly OddParents - Volume 1 USA None 256 Mbit
1497 GBA Video - Strawberry Shortcake - Volume 1 USA None 256 Mbit
1489 GBA Video - Sonic X - Volume 1 USA None 256 Mbit
1487 GBA Video - Dora the Explorer - Volume 1 USA None 256 Mbit
1469 GBA Video - The Fairly OddParents - Volume 2 USA None 256 Mbit
1468 GBA Video - Spongebob Squarepants - Volume 2 USA None 256 Mbit
1467 GBA Video - Spongebob Squarepants - Volume 1 USA None 256 Mbit
1467 GBA Video - Spongebob Squarepants - Volume 1 USA None 256 Mbit
1456 Tennis no Oji-Sama 2004 - Glorious Gold Japan Sram v103 - 256 kbit 256 Mbit
1456 Tennis no Ouji-Sama 2004 - Glorious Gold Japan Sram v103 - 256 kbit 256 Mbit
1455 Tennis no Oji-Sama 2004 - Stylish Silver Japan Sram v103 - 256 kbit 256 Mbit
1455 Tennis no Ouji-Sama 2004 - Stylish Silver Japan Sram v103 - 256 kbit 256 Mbit
1408 Mermaid Melody - Pichi Pichi Picchi Pichi Pichitto Live Start Japan Sram v112 - 256 kbit 256 Mbit
1330 Minna no Ojisama Japan Sram v103 - 256 kbit 256 Mbit