[appzattak]

Here is what I do. I PPCPimBackup, it backs up everything important as far as contacts, text messages, speed dial, calender, etc. I pretty much store everything else on my SD card. Then after a flash I use Sashimi to restore certain stuff, like mail account setting and some cab installs, then restore the PIM backup and good to go.

You can search for Sashimi and PPCPimBackup, it's all over these forums.