Well there has been a few post, so i thort id make a post
You can either.
Place a peice of wood against the crank, and bash it off with a large hammer.
(be carefull, it usually flys of rather fast)
Ride with no crank bolt, it will work it self loose.
(only if nothing else works you should do this, as it may round your crank off)
Heat it up so it expands, thus loosening the crank off.
(you will most probly have a big brown stain on your cranks, were they have burnt)
If all else fails, repeat step one, but bash it harder.
:(
From Sexymike
just a little tip
this is the best i cud find
put the crank on a vice with the bb inbetween (meaning u need to open it a touch)
u will have to get someone to hold the bike to
put the bolt into the bb and hit it, so that the bb *and bike* will fall out of the crank as it remains on the vice
Easy money.
:S