In Bb 2.0 takes the next step in YouTube-fuelled musical collaboration demonstrated by Kutiman's Thru-You and Tan Dun and Internet Orchestras. Named for the tuning of each clip, In Bb 2.0 is designed to give the viewer more control over the remix (though "Start All" and "Stop All" controls would be a welcome addition). Create Digital Music described it simply: “As the name implies, everything will blend, so you can start the videos as you wish, and control volume with the volume sliders. It’s part of the ongoing evidence that sometimes simple ideas can be deeply musical and effective."

Tinker is a Twitter aggregation tool that aggregates Tweets into “events” – and does so in a way its creators claim is “brand-safe” (filtering out negative conversation, surfacing only positive conversation in the form of what Tinker calls “events”). In some respects this is a step away from the Web’s overall leanings toward greater transparency. In another respect, Tinker makes Twitter more useful for marketers, which could in turn draw even more users into the Twitter and micro-blogging universe. Watch this Tinker demo video and visit Tinker.com to sign up and learn more.

It will be interesting to see what comes of Amazon’s Kindle Publishing for Blogs. Amazon describes it as “a fast and easy self-publishing tool that lets you upload your blog for sale in the Kindle Store”. See that part about “for sale” in there? My hunch is that makes more sense for an already-free blog to remain free when read on a Kindle, but I have yet to create an account and explore Amazon’s broader publishing program further. If you have, kindly share your experience in the comments. Thanks.

Three notable links for this fourth edition...

Flip for simplicity. Matt at 37signals' Signal vs. Noise shows us the elegantly minimal instruction manual for the Flip video camera (above). He points out that if a product does less, it becomes easier to explain and easier to use, and that serves as a form of advertising unto itself.

Relax, Charmin’s got your back. Charmin cleans up in the "social app to locate clean restrooms" category with Sit Or Squat - available via browser or Blackberry and iPhone apps, augmented by a presence on MySpace, Facebook, Twitter and StumbleUpon. Sit Or Squat began as a small blog in 2007, but after some growth and sponsorship help from Charmin, it’s proven itself more useful than locationally-limited apps like Diaroogle (previously on Tribal Drum).

A bicycle built for two thousand. Crowd-sourced singing may not replace American Idol any day soon, but Aaron Koblin and Daniel Massey could be (creepy) contenders someday. Using Amazon’s Mechanical Turk web service, they captured 2,088 voices saying/singing various syllables and stitched it together to sing Daisy Bell.

* Thanks to Brett Eveleth for his contributions (first and third items above) to this edition of Linkage.