hi! I've read somewhere there are no 3rd app crashes on 2.1 firmware. I tried to put login info into 1password app and then tried to login into mail.com through the 1password's browser. It was only password shown so I tried to put my email but first I got slow keyboard then 1password crashed. So, here is my experience with 2.1 firmware and 1password but everithing else runs great.
/iPhone 3G 8Gb 2.1 not jailbroken/not unlocked Windows XP Pro 6Gb/1Tb iTunes 8/