If you're like me and hatehatehate when a person's personal LJ style flows over into comments and such, you can get rid of them!
Adding that to the end of any LJ URL will force it into your style. In my case, it makes the colors clean and plain, and it thwarts those people who insist upon overriding the text-size-choosing-option in IE. (Grr! Why would anyone DO that? Are you trying to keep people from reading your LJ? Let people pick their own font sizes! Grrr!)
One little note: I think that if there is a ? in the URL already, a second one will not be recognized/acknowledged.