It's been "years in the making", but according to a news item at billboard.com, the long awaited tribute album to Joni Mitchell will be released in the spring of 2007:
Bjork, Prince, James Taylor and Elvis Costello are among the artists who have recorded covers for "A Tribute to Joni Mitchell," due in the spring via Nonesuch. The 11-track set also boasts contributions from Sarah McLachlan, k.d. lang, Emmylou Harris and Sufjan Stevens.
The complete track listing according to billboard.com is:
Free Man in Paris Sufjan Stevens
Boho Dance Bjork
Dreamland Caetano Veloso
Don't Interrupt the Sorrow Brad Mehldau
For the Roses Cassandra Wilson
A Case of U Prince
Blue Sarah McLachlan
Ladies of the Canyon Annie Lennox
Magdalena Laundries Emmylou Harris
Edith and the Kingpin Elvis Costello
(Note that just 10 tracks are listed. The 11 should be k.d. Lang's Help Me, as she is mentioned in the news item.)
The album was announced late 2000 with the title A Case Of Joni. Numerous artists have been submitting tracks to the tribute over the years, including Steely Dan doing a version of Carey. Looks like it's cut from the album toghether with a few others. What happened to PM Dawn Night in the City, Stevie Wonder Woodstock, Janet Jackson Beat of Black Wings, Duncan Sheik Court and Spark, Chaka Khan Hejira, Etta James Amelia, Elton John Free Man In Paris and Lindsey Buckingham with Mick Fleetwood Big Yellow Taxi? It's enough to do a Volume 2!