I have read that before the invention of monotheism, the Jews worshipped multiple gods of which traces remain in various texts. So I wonder whether it is possible to reconstruct it and what the gods there were.
One notable thing about the Hebrew Scriptures is that they don't typically claim that there aren't other gods; just that theirs is a jealous God, and thus the only one a Jew should worship.
This kind of attitude isn't really entirely unique in the ancient world. Most cities had their own patron god. A Pantheon was in many ways just the summation of all the regionally-worshipped dieties in an area.
There are mentions of other gods or supernatural beings throughout the Torah. My personal favorite is Leviathan, who based on descriptions in various parts of the Hebrew Scriptures, seems quite similar to the Norse's World Serpent (or perhaps a super fire-breathing sea dragon). Isaiah even prophecies a final battle between God and Leviathan (which God of course will win).
Baal is mentioned quite a bit in The Bible as well. However, that is basically a semetic word for "Lord". So essentially when The Bible uses that word it is saying "one of our neighbors' Lord god, rather than our own Lord God."
There is a community on the web, http://groups.yahoo.com/group/canaanitepaganism/?yguid=192651149, their theme is just the old Jewish paganism (canaanite?). Surely, you'll find there all these old gods, including Lord El and Lady Asherah.