One of our User Education writers who takes care of much of the Cider Extensibility documentation that will go into MSDN helped make the very early and beta set of docs on these subjects available for all to read.
You'll find them attached to this blog post.
You'll also find that aside from this blog and Brian and Soak's blog, there is very little little information out there on how to write things such as property editors, design time adorners, MenuActions (adding context menu items to the right click menu) etc. etc.. which makes these docs really helpful at this point in time.
PingBack from http://msdnrss.thecoderblogs.com/2007/08/24/cider-extensibility-help-documentation/
PM extraordinaire Jim Nakashima has posted some preview docs that describe how to do things like implement