Glimmerati I feel was a bit overrated.
A lot of people say N-gage games were shit, these people probably haven't played most of the games, especially the later titles which were brilliant.
Warhammer 40,000
Civilization (amazing version)
Pathway to Glory
Pathway to Glory Ikusa Islands
Call of Duty
Rayman 3
Roots: Gates of Chaos (Besst RPG on it)
Catan
System Rush
Tom Clancy's Ghost Recon: Jungle Storm
Xanadu Next
King of Fighters: Extreme
Rifts: Promise of Power
Snakes (Brilliant free game, basically a 3D snakes)
High Seize
A lot of people rate One highly but I think its a crap fighter. I really hope some of these games get converted to other consoles as they were very good. For a system that didn't have much support its games were pretty good.
The handheld itself I feel was poorly designed, it was the best phone to play mobile games on up until developers decided not to allow their games to be played on it.
Emulation side was ok, PicoDrive, is very good on it much better than the DS version. GoBoy is a pretty good GBC emulator. fMSX is great for MSX.
You can download the emulators here:http://www.zophar.net/consoles/ngage.html
I recommend you sign up to some mobile forums as you can get cracked versions of some emulators.