It’s now a common promotional tactic for albums to be available as a full online stream the week before their release. Bob Dylan is the latest artist to jump on the bandwagon, with his label Columbia Records announcing plans to stream his new Tell Tale Signs album on National Public Radio’s website.The stream kicks off tomorrow, and covers the full 2-CD compilation, which is part of the Bobster’s authorised bootleg series of rare and unreleased recordings. The album itself goes on sale next week. It’s the first time NPR has tried this kind of thing, following in the footsteps of Napster, MySpace and Imeem.Columbia isn’t stopping there with its promo plans for the new album. A free track will be given away on Dylan’s own website, while another will be distributed via Amazon’s MP3 Store, in advance of the full album’s release.