I've been standing for about a year now. My boss even hooked me up with a convertible desk so I can sit if I want - the whole thing slides up and down. I find I really only sit when I'm on a conference call, so that I'm not screaming over cube walls...

I would have a hard time going back to the chair full time. I still love to sit down once in a while, but now, sitting in my chair is like having a soda: it's a semi-rare treat. As for health benefits, I'm still fat - so don't let anyone tell you that this is a magical way to lose weight. I will agree with the article that my feet almost never get tired anymore. I am more likely to go get a drink of water, or walk over to some one else's office rather than call or IM. I have a back injury, and while I don't think standing has "fixed" anything, my back feels stronger. Any health benefits kinda sneak up on you. It's not like you stand for two weeks and shout for joy over stronger legs.

He's also right about your monitor height. Gotta be higher than you think. Do some research and figure out what is optimum for your body.

My desk: