I got tired of maintaining (or failing to maintain, as was more often the case) my custom CMS/blogging tool that was the previous core of nerd.cx, and so I switched to WordPress. It seems pretty good, I can hack on it if I need to, and I’m generally happy with the ability to pull my content back out. The community is also quite active, so there is less chance of getting stuck with something stagnant, which is always important.