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Try the above suggestions regarding chisels, gringing head off, vice-grips, etc. It has been my experience that a left handed drill bit works about the best if you have to drill them out. Extractors work many times, but are less effective IMO.
First center punch the bolt, then drill a pilot hole using a bit 1 or 2 sizes smaller than the left handed bit. Then use the left-hand drill bit to remove bolt, applying firm pressure. The bit should grab the bolt, removing it. The heat from the drilling proccess seems to work to loosen them prior to extraction. Some penetrating oil applied a few minutes prior won't hurt either. If the bolt won't come out with the first attempt, use the next larger bit and repeat. For this reason you don't want to start out with the largest bit that fits the bolt.
Left hand bits are available from Snap-on Tools, and, I'm sure from other vendors.
Dave
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