It would be nice if there were a MemeStreams plugin capability for NNW.

NetNewsWire v2.1 and later has a handy post to del.icio.us command that makes it easy to send bookmarks through applications like Cocoalicious and Pukka. Unfortunately, there are dozens of great social bookmarking services out there that are not supported by NNW. Brent Simmons, the creator of NNW, has publicly stated that he would support posting to other services when other intermediate applications were available. Postr attempts to be one of these applications. It supports posting to several online bookmarking services and includes a system to add others.