Jewschool has a post about rapper "Remedy" which includes a link to an mp3 of his hit "Never Again."
Over at Casa Valdez Jazz, David Valdez is giving outside improv advice that will help you be able to "play like Archie Shepp even at a Bar Mitzvah or your hotel lobby gig!" He's had a number of interesting improv-related posts. This Gary Campbell book, which David recommends here seems interesting.
Chaim sends a link to a post at Lost Remote.