I've received some great feedback on the Simple Sharing Extensions spec that I posted on MSDN last month. I'm working on updating the spec based on all of the comments, so I'm posting the proposed spec changes to the FEED-TECH list. I'll be rolling them out in a handful of emails; here is a link to the first one, and here is a link to the full list archive.
Comments and feedback are definitely appreciated! The best way to respond is to join the list and post your comments there.