A quick update - the Info-Mac archive site at <sumex-aim.stanford.edu> is back up and running, although you should still try to use mirror sites whenever possible.
Spacebar Magnifies Photos in iPhoto '08
In iPhoto '08, you can choose whether double-clicking on a photo will edit it or magnify it. I prefer my double-clicks to edit photos, but every now and then it's nice to magnify a photo. To do that, even when double-click is set to edit, just select the photo and press the Spacebar.