I now see a bugs thread has been started.
Delays on everything. I've got a Mac Pro with 6GB of RAM, X1900XT yaddy, yaddy. I'm not used to delays. Delays are from waiting for pull down menus mostly but also bouncing between applications.
1) My Minolta MC2530DL color laser printer driver is incompatible with 10.5. it was great with 10.4.10. I just fired an email off to the minds of Minolta.
2) If a Safari browser is left on the desktop and not touched for a little while, when touched again, it refused to work. It must be closed and a new Safari browser window opened to work again.
Add to the list.