Wish has been made into anime! Clamp in Wonderland 2, called Wish Gift Box is a plastic box with ushagi-sans all over it, with a VHS tape, a cd single and a booklet. The tape is a 5 minute video, first with the song WISH, and all the main characters in anime. Like the first Clamp in Wondeland, you have to watch it in slo-mo to get all the good parts. Like, Kouryuu sticking his tounge out at you, or the transformations of Kouryuu and Kohaku from chibi to ooki forms.
The second half has lots of cute scenes with Kouryuu chasing Kohaku, and the cats trying to make angel eggs in a pot with handles shaped like bat wings... and failing miserably.
The cd single has Anniversary of Angel, Tenshi..., Message from Kohaku, Wish (short) and Angel Egg ~ for Ruri and Hari (short) on it.
The booklet has a small comic with the cats and the clamp girls in their (what I refer to as) trogylite forms, interviews with producers, an explaination with colour pics from the anime, and then a story board of the opening. It ends with the words to Wish and Angel Egg.
To see what the package looks like (cover of booklet in the plastic case) along with an AVI and a scan of chibi Kohaku from the booklet, go to here.
For even more info, go to Usyagi's Wish Page with lots of screen snaps and stuff.