I tend to recycle accounts every so often, and make a reasonable effort to keep each account anonymous (although a determined creeper could likely identify me). I've also got a "real world" account, but generally prefer the freedom of posting anonymously, to avoid any potential Google-sleuthing later on.

It's a double-edged sword, though. Not associating opinions with my real world identity encourages me to post a lot more nonsense.. the freedom to be anonymous is also the freedom to communicate with no discipline, which couldn't be beneficial in the long term