Kill Classic Dead
If you're like me, you scoff at people who still use Classic and curse the dark gods whenever some oddly formatted file you've grabbed off the internet suddenly tries to launch a Classic app rather than the current OS X version. I mean, come on, people. Classic is so last century. It's the time of the Tiger, and it is time to kill Classic dead.
Fortunately, there's a very helpful hint up over at Mac OS X Hints, that shows you how to remove Classic and the Classic preference pane cleanly with minimal mucking about in the various Library files of your Tiger installation. This hint is pretty simple, but if you're Terminal phobic I'd recommend finding one of your guru friends to help you out.
And for goodness sake, backup before you attempt this.