There are hot-knife tools that are made specifically for cutting styrofoam, and I've also heard of people using electric chainsaws to cut away the foam. I don't really have that much to cut, so I can't really justify buying either a hot-knife or an electric chainsaw.
I've improvised by using my reciprocating saw with a very short blade. I make a couple of passes down each side of the slot, and then I use the claw end of hammer to hack out the foam. It does make a bit of a mess (that's where the hot-knife is better), but it works just fine.
For the tight spots where I have to take the foam out behind a floor joist... I just put a 12" blade in the reciprocating saw and make the cuts at a really shallow angle up behind the joist. Then I just poke away at the foam with a long screwdriver until it all comes out.
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