With all the excitement a few days back over the Aeron chair, which continually proves to be a classic design that nearly everyone loves, we saw this link in a comment by DM and had to post it:

The ergonomic Aeron chair is famous in offices worldwide for its comfort and adjustability. Unfortunately it will run you $650. Recently, Kevin Kelly wrote about a $300 Aeron copycat which he has been using for the past year. But for those on tighter budgets, I present the Homemade Aeron Chair (HAC). Total cost: $0. How your back will feel thanks to lower-back support: Priceless...

More Here (Thanks, DM!)