Start saving for a new bike!
Or, if you have a lot of nice bits on that one, get a new frame. I just did that with my bike. I had a Giant MCM980 full susser for 6 years and the wheels started to get a bit bent and then one of the seals went. I decided to use that as a perfect excuse to get a new wheelset and upgrade to discs at the same time.
So off I went and bought a set of disc wheels and disc brakes with integrated shift levers, only to find that there's no way that bike's ever gonna have discs on it because the disc touches the chainstay! Oops!
So there I am with a load of bits I can't use.
Answer, buy a new frame. I decided on a Giant Trance frame and then discovered that the Trance4 bike was only another £100, so I've bought that, swapped all the bits over and now have a nice disc brake full susser and an old one for sale on ebay with nice new wheels and forks!
What a polava!
http://cgi.ebay.co.uk/ws/eBayISAPI.d...MESE%3AIT&rd=1 P.S. This is not a shameless advert, just thought you might be interested in the story