While the Jaguar zoom functions are principally for universal access, the fact that OS X auto-smooths on zoom can be used to good advantage while browsing. I use it often while viewing online comics with small fonts, or when watching movies via browser plugins (where it's hard to change the size of the movies). Yes, not only text; even movies are smoothed on zoom!
Command-Option-* to turn it on
Command-Option-plus/minus to zoom in/out
Command-Option-\ to toggle smoothing.
[Editor's note: There's a lot of power in the zoom feature of Universal Access. If you hit the Zoom Options button in the prefs panel, you can specify a minimum and maximum zoom size. Try dragging the "maximum" slider to something like 10x, and then move and return the "minimum" slider to 1x. Now when you hit the zoom-in key, it will instantly jump to the maximum value you set. Hit the zoom-out key, and it returns to normal view. If you ever need more than the maximum, just hit the zoom-in key again while zoomed in.]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20021001061844504