The Billie Holiday Circle is on the Internet, visit this site. Jack Millar unfortunately passed away, but the site is now maintained by A. Couling. We will miss Jack and the unbelievable amount of knowledge he had.
The Billie Holiday Discography. Very complete.... Good lay-out, well worth checking out! It absolutely beats this site ;-)
If you can read French, well have a look at this site. It's a 'Hommage à Billie Holiday', I guess you like it!
Brian Lennon dedicated a great site to Billie. You surely can do some good research on it!
Billie Holiday for Ever This site is dedicated to Billie Holiday and especially to the story, life and music of Lady Day when she travelled to Europe in 1954 and 1958.
Vanessa Zoe made the Billie Holiday Desktop Theme.
The huge All-Music Guide contains a lot on Billie, just have a look...
Herman Leonard - Images of Jazz
Alberto Varela maintains a database in Excel format, it's a lot of work he's sharing. Also a spanish and french version of his page is available! (Ask him for the MP3 version of a song, he has them all!)
The Leonard Feather Scrapbooks contains a nice interview.
The Official site of Billie Holiday, if you have enough money to spend go there. If you recognise anything from this site, you're right, even my typo's they have copied!