While advance solicitations let us know about upcoming print comics, where are those advance notices of upcoming webcomics? Here's one -- an upcoming webcomic from writer Steve Horton called Spinning To Infinity.
Spinning To Infinity is a unique story serialized in one-page increments with each page telling a standalone story with a new artist on every story; consider it an anthology of stories with an over-riding story-arc. Horton has over 30 artists on-board, with openings for a couple more. Sequential artists are encouraged to contact him at firstname.lastname@example.org. Horton plans to launch the series later this year as an online comic.