rot13 obfuscation (about 20 mins)

Contact our sales department

ISO/Hex obfuscation (about 15 mins)

Contact our funky llamas!

Javascript obfuscation (about 30 mins)

Contact us...

More complex Javascript obfuscation

Javascript interpreter fell over.. oh well, nothing that couldn't be fixed

JS/Unicode obfuscation (10 mins to enable single line scripts in my parser)

Email me

Break them!

Total spammer time: 1:15 mins + extra 0.03s parse time/page
Total time for people to write all those cunning routines, blog posts, people to implement them in their pages: ??
Total time to use a free email with spam filtering: same time any email takes. Want an invite? davedx@gmail.com
(Oh look, I used my email address on a webpage!)