Prior to the fiasco that was my Ubuntu installs, I was having a lot of fun on TF2 jump maps. I've mentioned jumping on here before, but if you are unaware, check this out:
I've been jumping on and off for the past year or so and have gotten somewhat decent at it. I found This list of jump maps sorted in difficulty if you want to give them a shot by downloading the maps.
I've almost completed the 'Easy' category, though I fail a lot of jumps, so I'll probably hang out in those for awhile until I can do them efficiently. Most of my concern comes with skip jumps that require a large turn. It basically comes down to a fluid mouse drag while turning. My gut reaction is to always turn too fast, which causes you to not turn at all.
Anyways, if you are looking at some entertaining downtime, check out some of these maps. I can highly recommend jump_beef (courses 1-3) and jump_adventure (courses 1-2). I'd be happy to jump into a server with any of yall if you'd like to give them a shot!