I think it's funny when people don't trim their ROMs... I trim my ROMs myself, even GB and GBC ROMs. It makes a difference in the small amount of space you get on a 32MB NOR flash. I can usually squeeze in 3 or 4 more ROMs thanks to the extra waste being trimmed off. I shaved a few gigabytes of room off of my DS ROM collection by trimming. They all load fine from my emulators and flash carts, so I don't see why more people don't trim their ROMs. Complaining that Pokemon Black and White is 512MB (When trimmed, is only 280MB) is just plain stupidity on their part.