Physical therapy, and a lot of rest. Unfortunately, I don't have the money for the former, and since I run a web business it's kind of hard for me to go for more than an hour or so without sitting at a keyboard and typing madly away.
I do have forearm splints that I can use to limit the stress on my wrists while I type -- and I do believe that there are straps and such I can use to help my workout -- but until things slow down in my life it looks like I'm going to have to just do whatever workouts are safe for me to do.
Fortunately I can still use machines pretty effectively and so I can still get bigger with more tone. Unfortunately, I prefer free weights to machines for their practical value (strengthening syndergists, etc.).