PHP very fast, good portability, easy to learn
ASP fast, need extra components for port to non MS system ( chilisoft etc), easy to learn esp. if you know VB
Perl, fast, good portability, harder to learn more complex.
CF, fast, need extra components (but comes with product, CF server) Tag based fairly easy to learn....
Personally prefer either ASP or PHP....covers both OS (MS or Unix) both have good development tools, resources and most importantly are widely available on hosts
hth
Bastien