There's a great site about all things Beowulfish at the appropriately named heorot.dk. Of primary interest (at least to me) is the facing Old English/Modern English texts. It's an easy way to see, for example, what the old English word for a particular concept or creature was. ;-) You have to click a couple of times to get to the text, but they're pretty obvious links.

Beowulf in Cyberspace