As I did with .Text, I added Captcha anti-spam support to blog posting. Theory is this will prevent bot spam postings into my blog, and seems to have worked to date (no, that isn't an invite to see otherwise :) ).
There are a couple of ones out there for Community Server, but I liked Michael Trefey's the best. One of the main reasons is the ease in adding template support, so the code entry box can have a validator on it same as with the other controls. I like easy...