I mentioned before that I'll be doing a webcast on the Windows SharePoint Services native adapter included in BizTalk 2006 (see SeptemberWSSAdapterWebcast).
The "BTS 2006 Windows SharePoint Services (WSS) Adapter Deep Dive" webcast is now available on the Microsoft Beta Place http://beta.microsoft.com/ , Microsoft BizTalk Server 2006, under the Additional File Downloads section.
If you haven't signed-up already in the BizTalk 2006 Beta program, then go to bts2006beta to see the instructions.
The videos are shared on this SharePoint site: http://wssadapter.members.winisp.net/default.aspx, in the Shared Documents document library, WSS Adapter Webcasts folder.
This posting is provided "AS IS" with no warranties, and confers no rights. Use of included videos are subject to the terms specified at http://www.microsoft.com/info/cpyright.htm. Some of the content was developed for the BizTalk Beta builds, but it is still generally applicable to the RTM version.