John Gruber linked
the blog of Mike Rohde
, a visual designer who discovered a slick scrolling trick built into Mac OS X: with a standard scrolling mouse, you can hold the shift key in most apps to scroll horizontally. Mike cites his day job apps like Photoshop and Illustrator, but this seems to work in NetNewsWire, Firefox and iTunes as well. I'm not sure if this is a 10.4 Tiger-only thing (anyone care to share?), but it's a handy little trick for those who aren't exactly enamored with the Mighty Mouse.