"Into the Rainbow - A Tribute to Nick Webb" was released in September, 2000 by the band Kymaera, featuring Simon James, Nick's original Acoustic Alchemy partner. (AA was founded in 1980! Simon left in 1985 and was replaced by Mr. C.) It includes a number of James/Webb tunes and "Hearts in Chains" (Carmichael/Webb), with guest artist Greg Carmichael.
My copy (signed by Greg) has a different cover than is shown at the link you included. It's a graphic of the letter "R" with the vertical line represented by a guitar fret board and the curved line made up of several colorful lines representing a rainbow.
Hope this helps.
Bob