Can't wait to get GarageBand!
My only concern was about the audio in port of my TiBook which I though was mono, but I just checked and it's stereo. Now I hope that GarageBand can deal with a stereo audio input, because I have much more virtual amps and effects in my Boss GT3 guitar processor than GarageBand has, and it would be too bad if it had to be recorded in mono. Anyway, this will be the first time I plug my old Stratocaster into my Mac, and I look forward to it!
And I'll have to get a midi to USB adapter, or to figure out how to use under Mac OS X the midi/serial adapter and the Keyspan I still have, for our Korg piano and Roland SoundCanvas.