Seriously, network. Get to know the bigwigs and spend some quality time with them. While I'm not advocating purely kissing ass, cause then everyone will say you're only a kissass, I am saying know who affects life at your company and make nice. It's not what you know, it's who you know. Once you're in, then you can show them what you know.
Second, do good work. No, I'm not saying you can't bull every once in a while, but whenever you turn in product, make sure it's the best you've got. That way, no one can say you don't know *&^% and you're only there because you kiss ass (see above).
Otherwise, I know you know they watch your internet usage and can track your sites, so no porn, no private emails you don't want your boss reading, and if you ever have a personal problem with anyone, don't send it in an email. Take care of it in person so there's no misunderstanding and, most importantly, no record!!!