It's good that there's some way to do it, but it's not really an acceptable solution to have to remember separate keystrokes for separate applications. Tweetie's scroll view should respond to the same keystrokes as every other scroll view in every other app.

For me "space" pages down and "cmd + space" pages up. I agree with @benjamin that this is not intuitive and would have not found this if it were not for GetSatisfaction and @craig above.

I agree. What I'm missing most is the Home key (or Command-Up equivalent).

Jumping to the top with "cmd + up arrow" or "home" would be nice. Way to go @adam!

For me to scroll I have to press the space bar and to scroll up I have to press shift + space. Weird.

I prefer page-up to shift-spacebar (simple keystroke vs. a chorded one)

Page Up/Down keys are the natural way to do this. I shouldn't have to get used to using space, when in every other UI, I can use Page Up/Down and Home/End to scroll quickly.

Another vote for true PU/PD/H/E support. Spacebar works for now, but isn't as tightly bound to muscle memory.

I also hope that I can use Page Up, Page Down, Home, and End in Tweetie soon.

I can't imagine the thinking behind resetting PgUp and PgDn as spacebar combinations. Glad to have learned that, at least, and think it would be daft not to fix this in the next version.