Haven of Home has a nice tutorial on how to recover your couch without a sewing machine. Fact is, the cover wears out long before the frame. This is one thrifty skill worth learning!
I have mentioned before if you don't feel up to doing the whole job yourself you can customize ready made slipcovers by buying an extra cover to make pillowcase-like covers to slip over loose cushions.
While you are there you might enjoy following her pictorial de-cluttering.
Starry Sky Journal 
I have noticed (through the “sitereader”) that I have had several hits through your website, so I came to see why…
I didn’t realize that you’d linked my re-upholstery post! Thanks for doing that!
I have recovered SO many couches for myself and friends over the years using this technique. It’s fast, easy, and CHEAP.
I came to your site several months back because of someone else’s link for the FANTASTIC Home management information. Thank YOU for making that available!
Roxanne