/n software has made available in PRERELEASE form the IP*Works!
EDI AS2 Connector. It is completely free for 1 trading partner.
The software itself is a .Net application with an embedded web server, which allows you to configure trading partners to exchange EDI documents with over AS2.
Technorati tag: EDI
Technorati tag: AS2
Update: EDI AS2 Connector screencast (WMV or Flash)