I've recently replaced three lenny servers (two LAMPs and a name server) and rather than go with Wheezy I migrated the three of them to OpenBSD. On one I added apache from ports, the other I was able to use OpenBSD's new httpd and I found I really like OpenBSDs built in named.

Other than that I've been playing around with FreeBSD and have revisited Slackware which was the first Linux I was introduced to via a book/cdrom back in the mid 90's.

Having had some success with OpenBSD on servers I'm running it on a laptop as one of two workstations at work. The other has Wheezy on it. I'm able to do most of my day to day work on OpenBSD but do find myself remoting into the Linux box for some things (e.g. mysql-workbench).