Ah, synergy. The new version of Napster released Thursday hypes the new single “I Did It” from Bertelsmann Music Group’s Dave Matthews Band, whose new album “Everyday” won’t be in stores until Feb. 27. Netizens have to download the new version of Napster to get a direct link to the free song, which is also available at DaveMatthewsBand.com. To take its new BMG relationships one step further, Napster version 2.0 beta 9 also includes a link to CDNow, the e-commerce outlet bought last year by BMG — which also will take a share of the file-swapping service provided the latter develops a subscription-based service. The e-commerce link, which is the first visible revenue source for Napster, will also provide data as to how many users of the service actually wind up buying CDs. The U.S. 9th Circuit Court of Appeals is still pondering whether to uphold an injunction against Napster that was made at the request of the RIAA.