in reply to Is CPAN usable now?
This should, in most cases, be able to provide you with the information on whether or not a module passes its tests on your platform. Naturally this tells you nothing about how nice the interface is, how well the module gets the job done, or if the tests are well-written. But it can be a starting point in determining whether to use a module or not.
And, if you're serious about making CPAN a better place, you could do worse than joining the testing effort.
On a side note, the recent 0.032 release of CPANPLUS (seen on perlmonks here) includes a plug-in for seeing and sending test results. An article about these features should be appearing on perl.com real soon now. Update: the article.