Songs:
Anything at all by Damh the Bard (he has a website somewhere I think)
The Levellers have some nice godessy stuff - 'Elation' or 'Maid of the River'.
The Bostcastle museum of witchcraft have a cd - mostly chanting and probably only available from them but worth a try if you ever head that way.
There's a few interesting things on the 'wicker man' soundtrack.
Trefor and Vicki Wiliams have some decidedly interesting material on their new CD 'Timeless Land' - the title track may ring bells for anyone in love with ancient landscapes, there's a song somewhat inspired by tarrot, and a superb green man song.
'The Cry of Tin' cd, (ask Tom and Barbara Brown, I got my copy from them) also has a good green man song on it and one about knockers (in mines, not breasts)
Graham and Eileen Pratt's album 'lark in the clear air' has an excellent song about Merlin on it.
There's also some very interesting material in the Kipling/Bellamy - the tree song.

being Pagan and Folky, I've been colelcting suitable material for some time, there's a lot of it out there, not necessarily by, for or about wiccans or any other sorts of pagans, but which may well be resonant for anyone of that inclination. Jon Harvison's 'turning of the year' is excellent. That's everything I can think of off the top of my head.