When on a budget, anything free is obviously great. Looking around in my shop today I realized that I have very little money invested in my hobby. I have spare doors ($0) that I lay over sawhorses to make my assembly table. Stack another door ($0) on that and it is perfect height to use as an outfeed table for my table saw. My miter saw station is a discarded dresser ($0). I took apart a laminated entertainment center ($0) to make some perfect oversized router plates for more surface area when routing. I also would recommend a french cleat system to anyone looking for wall storage. Mine is a bit overkill but again I was using material I already had and it allows for shop upgrades and rearanging in the future. I guess what Im trying to say is that with a little outside the box thinking anyone can add more function to their shop for next to nothing. Craigslist is GREAT as well.
-- Jay - http://www.jayscustomcreations.com or http://www.woodworkingwithsketchup.com