Since I started the poll I should jump in here and explain my own vote - "2"
I have jailbroken 1.1.4 and am completely satisfied, both with the way the touch operates and with the applications I have. I have not had a bit of trouble.
Reading other threads here led me to believe that, whereas many of you kind of like 2.0, you nonetheless have been having problems with heating up, slow applications, low battery life, crashing, etc. It seems that you are just accepting those problems, saying you like 2.0, but...
For myself, since 1.1.4 is solid, I couldn't see any reason at all to go with 2.0, especially since none of the new features or available applications were any different from what I have with the jailbreak.
I haven't gone through the iTunes applications site to examine every available application but with a quick read-through it looks like 90% of what's available is games. How many games does one need? I have 15 games on my touch but only use four with any regularity (sudoku, four-in-a-row, parking lot and peg jump). My games are all logic games of one sort or another. It looks like many iTunes games are action games. I really don't see the touch as an ideal platform for action games. It will handle them, just not as well as other devices.
Anyway, my "2" vote means simply that I haven't seen a need to "upgrade" to 2.0 and lose what I have now.