If you're a lucky one with an iPhone or iPod Touch and want to upgrade to the 1.1.2 firmware but don't want to lose your custom apps and setup, conceited software has released a windows/linux solution as TUAW. I've as yet untested by myself on my Touch, so read the comments and research before you put your baby at risk. Apparently the big draw to the 1.1.2 release is a speed boost, but that looks like about it (unless you use non-english characters a lot).