The rasp Paul mentioned is a "four-in-hand" or "shoe" rasp. They are very good for taking down runs and drips and available in different sizes and quality. Nicholsen makes good ones.http://www.amazon.com/Nicholson-Combination-without-American-Half-Round/dp/B001SAFFYM

Also a tool that has recently come on to the US market is a Japanese float. This is like a rasp but with long smooth blades instead of small point teeth. These leave a smoother finish than the typical rasp, but are more aggressive than a file.

The float style tool is available from Japanwoodworker http://japanwoodworker.com/dept.asp?s=JapanWoodworker&dept_id=23042 and Highland Hardware: http://www.highlandwoodworking.com/woodworking-tips-1012dec/iwasaki3.html

I also like the Shino Wood Rasp which can quickly level a run on a flat surface down to nothing without touching the surface.

The floats are nice but get pricey so I generally stick to the 4-in-hand.