Ok, here may be a few points of interest:
*Amaunet was an Egyptian snake-headed goddess whose role was healing.
*Mehen was an egyptian god in the form of a coiled snake. He was the protector of the sun god.
*Meretseger was another Egyptian goddess - her name name transleates into "she who loves silence".
On King Tut's mummy mask (poised at his crown) are a vulture and a cobra rearing to stike - the snakes role was to protect the king from attack by enemies. This cobra was a godess by the name of Wadjet whose oversaw the north.
There are alot of stories in Egyptian Mythology involving snakes...some are good, some are not. Most of the stories deal with creation or some sort of involvement with the gods and can be lengthy.
Unfortunately, I don't know any GOOD stories involving snakes in other cultures. As far as I know, most stories involving snakes give them a bad rap. Maybe there's something to be said for snakes in one of the Asian cultures...perhaps in Chinese mythology?
I'd be interested if anyone had any information on GOOD mythological stories from other cultures involving snakes as well!