As a long time open source user and a chronic challenger of own assumptions, I often test out the alternatives to my current prefrences. While I used Linux, I tended to switch desktop environments every two months or so. I tried out all the e-mail clients, all the browsers, all the VCSes, and even (almost) all the text editors. Before settling with Drupal, I tried out all the CMSes I could find.

I have long felt compelled by PostgreSQL, although it is in many ways a bastard in the Drupal community.