Check out today's MobilityWOD.
Here's some random stuff off the top of my head, starting with the acute phase and moving to the maintenance/rehab phase.
1) Deep friction massage. (Massage perpendicular to the direction the tendon runs). It's gonna hurt pretty badly at first, but it should stop hurting so bad after 5-10 minutes.
2) Ice massage. Do this directly after the deep friction massage. 4 x numb per day until the acute period of inflammation is over. Easiest way is to fill up some dixie cups with water and put them in the freezer. After they're frozen, rip off half the paper and you've got the perfect ice-massage.
3) Cold water immersion. Switch to this from ice massage after the acute phase, ie, when deep friction massage is no longer painful. This is really an awesome technique, and I've had it work for various ailments for me. The idea is to immerse the body part in cold water. You want the water cold enough so that the extremity flushes with blood and turns pink after 10 minutes, but not so cold it turns white. Keep it immersed for 30 minutes. The point here isn't anti-inflammation, but rather to bring tons of blood to the tendon so it'll heal. It works best for finger/hand injuries, but it is possible to do for a knee.
We happen to have some thing like
this laying around for summer parties. We also have a multi-level deck (one-step). I lay on my stomach on the top level and put the bucket on the lower level. With some towels for padding on either side of the bucket, I'm able to comfortably submerge my knee while it's bent at 10-15 degrees.
4) Eccentric loading. Try one-legged, inclined eccentric squats. Find a good incline (board), and squat down with the bad leg. Squat as low as you can without tilting hips or sacrificing form. When you get to the end of your range, stand up on your good leg.
Personally, I'd wait until I could do the eccentric loading without pain. But maybe I'm paranoid. I dealt with bad patellar tendonitis for 1.5 years that ultimately required a tendon debridement (during which they found a piece of bone that had ripped off the tibial tuberosity but never showed up on any scans).
Just my $.02. Not a doc, and don't claim to be an expert on this shit. If you're really serious, you might also try rolling out and stretching your calves and IT band.