Cog is a little webdev framework of mine, a work-in-progress steal from spending couple of years in different companies.

Since A/B testing is considered pretty fundamental to most of my clients, I thought I'd share with the dear community of HN one possible implementation of it. You can see A/B testing in action on the sample page:

http://github.com/waverz/cog/blob/master/cog-guestbook/pages...

When used together with scriptor, an A/Btest is about 1 line in the design file (db rows, and counters are automagically set up on first page visiting). Stand-alone you might want to integrate it with a templating engine of your own :)

Code is PD, and review is more, than welcome.