Today I ran across OldVersion.com who's tag line is "newer is not always better." OldVersion.com is a collection of old versions of programs. When I saw it, I thought of a couple of benefits: first old version often run better on old computers because newer versions require more resources. Second, some new versions disable features that you want or add features that interfere with how you use the program. One benefit I hadn't thought of that's listed prominently on the site is the ability to avoid spyware. Older versions of programs that are now bundled with spyware are often less tainted than new programs.
The most popular downloads? DeadAIM 3.2.8, LimeWire 4.0.7, Yahoo Messenger 5.0, Winamp 2.95, and WinMX 3.31. Older versions of iTunes are also available for those of you who don't like the additional CRAP restrictions that are part of newer versions.