I recently had an exchange on SPSSX-L where someone asked about this link.  I suggested the "stat's coach" in SPSS's help for SPSS users.  But … I like the chart regardless, and it comes in handy when teaching multivariate stats.  Check it out.

http://www.datastep.com/StatisticalSelectionGuide.pdf

Another intersting version of the same thing was also on SPSSX-L.  My apologies to the poster for not replying, but there was a request to explain the whole thing!

http://www.ats.ucla.edu/stat/mult_pkg/whatstat/choosestat.html

And I found this link on the SPSS blog:

http://www.stat.tamu.edu/spss.php