1.1.3 jailbroken
I always upgrade to the latest jailbroken version a few days after it comes out and I see that there are no real issues with it (from the comments of others). I've not had any problems with any jailbreak procedure.
Love my 3rd party apps - mostly games - PocketGuitar, iPhysics, Pinball, iBlackjack, iSlots, iSolitaire, iCrossword, iBooks, iDigger, and Domino.
But I spend most of the time in Safari, Phone, or watching the latest Music Videos or movies - usually while taking the Light Rail here in Denver to go downtown.
But wish Apple would "fix" or "add" Outlook Notes sync (although I'm working on a Windows-side app that does that), and have a quick "Airplane" mode switcher app and cut and paste as well as ability to phone number on a calendar pop-up (i.e. a conference call number).
Hopefully with the SDK there will be a wealth of new apps/features coming out. Time will tell.