That's not entirely true. You can disable iCloud syncing for individual Apple apps, but 3rd party apps are all-or-nothing. You can't disable iCloud syncing for a single 3rd party app.
(That's a serious question, BTW. I would check it myself but I can't upgrade to iOS5 until I figure out how to get Windows DEP to stop killing iTunes 10.5 every time I launch it.)
I didn't find that setting screen. Definitely didn't see that in Settings/iCloud. I wonder how you get to that... I only had a chance to briefly look at my roommate's 3GS on iOS 5; won't be on iOS 5 myself until my 4S arrives later today.
Weird. On my roommate's 3GS upgraded to iOS 5.0 (I've not upgraded mine yet as my 4S is arriving today), I did not see the screen shown in the screenshot linked in the post above in the Settings/iCloud section. There were toggles for all the Apple apps, but 3rd party apps seemed to only be able to be toggled all at once, with a toggle called "Applications and Documents" or something of the sort. How do you do it?
http://i.imgur.com/acOje.png
(That's a serious question, BTW. I would check it myself but I can't upgrade to iOS5 until I figure out how to get Windows DEP to stop killing iTunes 10.5 every time I launch it.)