ESPN is reporting that Bonds is on crutches again. Bonds explains why on his web site:

I just wanted to give you an update of what happened Thursday, 4/21. I had some fluid drained out of my right knee because there was a little bit of swelling. By draining the fluid, it alleviates the discomfort. My doctor wants me to use crutches for the next couple of days to make sure the fluid doesn't come right back. This was merely a precautionary measure. My spirits are still high about my recovery as a whole and I can't wait to get back to rehabbing next week.

It's pretty obvious that he won't be back on May 1. His original estimate of 1/2 a season seems a lot more reasonable at this point.