I put my modules on CPAN and Freshmeat because they serve different audiences. Someone searching on CPAN already knows they're looking for a Perl module to solve their problem. Someone searching on Freshmeat might not have decided on an implementation language yet, but that doesn't mean I don't want them to find my work. Users and developers are the life-blood of an open-source project - anything you do to get more of them is time well spent.
-sam