I ran across this incredibly awesome computer chair / bed earlier today. It has all the bells and whistles, including specially placed pillows to distribute your body weight, armrests that support both arms and a monitor mount that gives you a great view of your screen. It even looks sort of like one of those Imperial Speeder Bikes from Return of the Jedi, which just adds to the coolness.
The downside to it is that even if you were still able to buy one (the manufacturers website does not appear to exist anymore) it would apparently cost you in the neighborhood of $4500. Which may be too much to spend on a chair. Maybe. Then again, maybe not.