Jeremy Bader is an excellent bike mechanic. He works well on fancy bikes as well as solving problems for my commuter bike that barely holds together.
I don't have extensive history with Jeremy, but he has rebuilt one wheel, replaced a bottom bracket, and generally tuned up my 'cross bike for racing.
Quality work, quick turnaround, well priced (even cheap at times). A good, down-to-earth mechanic. Plus, Madison Bikes is a fun little shop; two guys and a chihuahua (don't be detered).