Not sure how good it is (or what your budget is), but this one seems to fit the bill:
http://www.joann.com/joann/catalog.jsp?CATID=cat3485&PRODID=prd40405When I first moved into my apartment, I tried a 4 foot folding table ($40) from Home Depot. Yeah, that thing shook A LOT. It was painful to listen to. As much as I wanted to have something I could put away when not in use, it was tough to find something that was small enough and didn't shake. Eventually we decided to buy an extension table for our Ikea Expedit bookshelf, so now I sew on this:
http://www.flickr.com/photos/amatricis/3101018579/in/photostream/ When I'm not using it, we put other cool stuff on it, like the iMac sitting on the ground in that photo

I also get to store most of my fabric and sewing books on the bookshelf now, too.
When I lived with my parents, I just used the dining table.
Basically if there's nothing that will fold + not shake, try to find something that can serve multiple purposes.
