If you're interested, there are basically two governing bodies when it comes to rope access. IRATA (International Rope Access Trade Association) and SPRAT (Society of Professional Rope Access Technicians). I'm a Level II tech with SPRAT, and if I ever get the time...I'll challenge the IRATA course as well so I have that certificate as well.
I haven't had the ability to get too much time on rope this year, my full time job doesn't allow me to use rope access (long story, too many people that don't understand it). I work with a few different people in town that use rope access, and have worked with some of the window washer groups (although I have some very strong feelings about a few of the window washer groups).
I've been doing it for about two years, and it's a good time. Except when it's cold out. You're exposed completely to the elements while on rope. But I've had the chance to rappel off towers at SAIT, Fairmont Chateau Lake Louise, multiple buildings downtown, helped to train quite a few new rope access techs, participated in some advanced rescue courses, and even helped with some confined space/trench rescue courses (on the rope side of things). If you're willing to work at heights, and respect them fully, this is a great trade. There are many different things you can do...Check out SPRAT's webpage here:
http://www.sprat.org/, IRATA's webpage here:
http://www.irata.org/. If you want to learn the trade, or can convince your current boss to pay for it, send me a PM, I'll get you in touch with the group I work with that does some training for SPRAT (or if you need anything other training for work at height).
Here's an example of how rope access should not be used (although it looks like a hell of an adrenaline rush! Warning for language, so turn the volume down if you're at work or kids around. IRATA does not approve this due to the swing factor, you're not allowed to have any swing factor when you're working in rope access.
http://www.youtube.com/watch?v=W04m2UJK3M0