I have been wondering this since I bought my G1, why cannot the SD Card be in EXT3 or EXT4? The reason I ask is, because I have a 8GB SD Card and I have put a ton of map tiles for AndNav2 on it and while it only totals up to 1.2gigs, I only have 200MB left. I find this to be a total waste of space, is there anything else I can do? Btw, I am using the T-Mobile G1 with Cyanogen 4.0.4. Thanks!