I love Tiger, it's fantastic, especially Mail.
BUT...
One thing is driving me INSANE!! When I reply to an email I hit Apple-r and start typing straight away - Mail always buffered what I'd typed before the window had drawn, and filled it in once the window was there. Mail 2 doesn't do this!! I'm desperately trying to reprogram my brain to pause, but every time, I hit reply and start typing... then the window appears and I have to go back and fill in the first few characters. I can't believe something so simple like this got through bug testing. Buffering the keyboard input is hardly rocket science is it?
/prays for a 10.4.1 that fixes this/