I made a NAND backup but I thought I saw one posted online (plus after going with another ROM you probably won\'t think about the Sharp one again ). As for other backups, if you have synced up then you won\'t lose any PIM data. Any other things you have on the machine that you want to keep (development scripts, other data files, etc) you should backup to SD/CF or your PC. You might want to keep track of all the things you have installed - c++, java, libs (like SDL, etc) so you can get back up and running with all your expected apps. I use Cacko 1.20, but I think I might try the 1.21 to see if it helps with my Socket BT issues.
-Gary