Scott385, when I had an office job, I walked every day during my lunch break and eat at my desk afterwards. It made a HUGE difference in my mood and productivity. I'd love to do that again now that I am (theoretically) working from home.
Cynosure, you are right -- making the exercise part of my social life would help. My walking partner moved away last summer and I still haven't found a replacement.
Fembot, I hope you didn't lose any important messages! I just found one today that I thought was spam... and it's two weeks old and a bit late to do anything with now