Only a few days ago while discussing the idea of "Facebook for the enterprise" with someone via e-mail I wrote that "Its certainly worth watching what all the big players have to offer and how they are evolving."
Well, SAP is a big ERP software company and they are certainly looking at Web 2.0 - both from an external product perspective and for their own internal benefit. SAP appear to have two social networking tools that they are working on right now:
Harmony - as the inside the firewall social network - interests me most at this point, and from this "beta" version screenshot it looks like it support user profiles, group membership and awareness (through messages). However, in this variation it looks like it offers extra features such as skill profiling, recommendations and what looks like a Facebook-like Wall (but perhaps only one way).