Cannondale Lefty DLR Ti Fork Rebuild/Maintenance
First thing you should do is read the tech sheet on your fork. I believe the link below is the correct one.
http://www.cannondale.com/CMS/Technology/10_HeadShok_Tech_Pages_CUSA.pdf

There are also a bunch of manuals here but I didn't see one for the DLR Ti.
http://www.cannondale.com/usa/usaeng/Instructions

As far as a rebuild goes it will be similar to rebuilding any fork with oil in it you'll only have one leg though. I found an illustrated tear down which might help you with the decision or whether this is for you or not.
http://forums.mtbr.com/showthread.php?t=221683

The big question is, should you do this yourself. I do all my own maintenance, build wheels and the only thing I don't touch is forks. Most home users just don't have the facilities to really do this easily. If you have a nice shop stand setup and are mechanically inclined then go for it. I know I would if I had the space but I don't.