Wood router bits have different cutter geometry than metal cutting endmills, and should give cleaner cuts with less fuzzing and burning, but you need to find the optimal rpm for the feed speeds you are using. If your looking for spiral bits, check out
http://www.vortextool.com/index.cfm
They make great bits and also sharpen them, too. Mostly larger sizes, but they do have a few smaller than 1/4".
Gerry