I am completely into Explosions in the Sky "The earth is not a cold dead place", and entirely recommend that if you get the chance you must see them, I was moved to tears.
There seems to be a view that post rock should be quiet - I really don't agree with that at all.
Other recommendations:
Youth Movie Soundtrack Strategies: Mini LP "Hurrah! Another year, surely this one will be better than the last; the inexorable march of progress will lead us all to happiness ..."
http://www.ymss.org.uk
Lightning Bolt:
Get anything you can by them, this is the most exciting thing I've heard for ages, the DVD is great for an insight into the live experience. One drummer and one Bass (bottom string is a guitar string).