How many times have you searched for something in SharePoint that you KNOW is out there and has been crawled, but it doesn't come up in your search results?  Then it hits you like a bolt of lightning...you searched for the singular version of a term but the term that's out there is the plural version.  Why didn't it come up in your search results?  Do you really need a best bet for that?  Nope.  You just need to enable Search Stemming, which btw is native to MOSS 2007.  Here's how:

1. Navigate to the search results page
2. Edit the page
3. Modify the "Search Core Results" web part
   1. Expand the "Results Query Options" section
   2. Check "Enable Search Term Stemming"
   3. 

Yep - that's all there is to it.  Now - why isn't this enabled by default?  Apparently this is not supported in all languages, thus it's disabled by default.  Now if you can just remember to do this with every implementation you would be all set.  :)