From wikipedia:
Rising Stars of Manga (RSoM) was an annual comic anthology published in English by TOKYOPOP from 2002 to 2008, as well as the name of a contest. It was originally semi-annual, but switched to annual beginning with the 6th volume. Currently, the program is suspended, as TOKYOPOP is not accepting any submissions at this time.[1]

Each issue represents the results of a contest, in which aspiring comic book artists from all over the U.S. each submit a 15-20 page one-shot comic. Tokyopop staff select the best entry in each genre category (Comedy, Action, Mystery, Romance, Drama, Sci-Fi, Fantasy and Horror) to publish in the anthology. Each winner is awarded a $1000 prize. In addition, a People's Choice winner is decided from around 20 entries by votes from online viewers or users of the Toykopop website. The People's Choice winner is awarded $500 and is published in the anthology as well (although a genre winner may also be the People's Choice winner). Before the seventh RSoM competition (in 2007), the staff of TOKYOPOP picked one grand-prize winner, a Second and a Third prize winner, and eight runners-up with no distinctions in genre.

For more info on oneshots and authors featured, see here.