Apple Logic Pro /LogicExpress Discussion

Being relatively new to OSX (and Logic Pro 7.1), I have a relatively 
simple question.  It seems that Mac OSX files are a little more 
"scattered to the wind" than OS9 files (kind of like MS Windows).  Is 
there an easy way to uninstall files?  Some software packages now come 
with uninstallers, but many don't.  When I am finished demoing plugins 
and other software, I have to do search for all related files and delete 
them manually, a pain.  And even then, I occasionally find scraps of 
files still remaining.

Thanks!
Dave