Jaman, the Silicon Valley movie marketplace geared to indie content, is introducing ad-supported streaming this week. That adds a second revenue stream to Jaman's business model, which was originally built atop selling downloads and rentals of films.I don't think this is a surrender, indicating that downloads and rentals aren't working for Jaman, but it has undoubtedly been a challenge for the site to get visitors to hand over their credit card information... and ad-supported streaming makes it easier to simply start watching a movie that looks half-way interesting. Jaman will offer 100 ad-supported titles to start with.Here's the TechCrunch coverage ... and the official press release.