I tend to get a lot of 'Network Cleanup' projects. I think it goes back to the satisfaction I get when things are all neat and tidy - thanks mom. Tim O'Neill even referred to me as the 'Network Janitor' in some of his articles.
Oddly enough, I enjoy figuring out what customers have, how to make it work better, what to replace, what to rip out and delivering the final product; a clean, well documented network. Then again, how many people can identify a Memotec x.25 Pad, 3174 IBM Controller or an IBM 8228 MAU? Yes, I still run into that stuff. Then there's the whole CSI-type angle where you need to figure out how things ended up in the current state. If I'm lucky I can help consolidate some equipment, or eliminate excessive equipment or cabling. I can't tell you how many times I am referred to as the 'site specialist' with only 2 or 3 weeks at a customer site.