Jeremiah Owyang posted about Explaining OpenSocial to your Executives which is a different way of looking at OpenSocial, than say, if your a Widget Developer or Application Developer.  Jeremiah points out that:

"…Web Marketing no longer is limited to your corporate site. Let go of the concept of ‘driving traffic to your website’ as a sole measurement of success. The web, it’s message, and your battles are now fought on the open and distributed web. Trusted decisions between prospects and customers are made on these social communities and networks, savvy executives need to go there."

"….Your existing applications become social: Now, your standalone applications can now be shared with communities. If you’ve already spend resources on creating interactive marketing, large libraries, or other projects, consider how they can be re purposed on these websites, be efficient with your resources"

Jeremiah Owyang suggests to wait a little (say, till early next year) - "..Wait and watch: Unless you’re already have successful widgets deployed on Facebook, wait a bit, no need to jump in, let the alpha teams build and break."