Solo Cale and related artists links:
iMusic Rock Showcase - spiffy site with a bio, sound samples, and a bulletin board
BEEP - This is actually a Brian Eno discography, but there's lost of Cale-related info here.
Corporate links:
Artificial Intelligence - Promotional page by Beggar's Banquet with a bio
Rykodisc Records - Rykodisc, Hannibal, and associated labels online
Island Records - this'd be a site for...you guessed it, Island Records
Velvet Underground links (There are, of course, many more of these, but these two are my favorites and most of what's decent is linked to them anyway):
The Velvet Underground Web Page - amazingly complete, with lots and lots of pictures, sounds, etc.
All Tomorrow's Parties - chock full of good stuff, including essays not found elsewhere and the Click and Peel Banana