I remember a long time ago I used to see a certain compression format around... I uncompressed a 120MB file to 2GB... I cant recall what it was called (UHARC maybe?)

I'm looking for something like that...What's the best compression program that I can find? the one that I'm talkign about is better than ZIP/RAR or anything (it takes a LONG time to compress/decompress though). Does anyone know what's the best compression program I may find?