No, I have never done an evil campaign. I have seen a couple of posts on the site from some folks who have been in a campaign like that though. The closest thing to an actual evil campaign that I have done is that there was one time that I managed to get an evil NPC (non player character) into the party. The NPC was actually a henchmen of the parties main adversary. When the party was getting close to the adversary's stronghold, they devised a plan to gain access that with any luck would not draw attention to themselves. They woke the next morning only to find that the NPC skipped out on them in the middle of the night while he was standing watch. It didn't take them long to realize that their plan was now seriously compromised.
There is a thread on the forums that has a whole debate about different levels of evil. Going with some of the view points on there, I do think that it would be possible to have an evil aligned party that is not bent on total world domination. They would however be completely interested in making things better for themselves, no matter how it affects anyone else.
At the present time, I'm not inclined to have a game with a totally evil alligned party. Just not my cup of tea.