How to enable cross posting to another CS instance...
If you're looking to enable cross posting to another install of CommunityServer that supports it, you can setup your blog to cross post all of your postings to that other instance.
Here's how.
Go to your Dashboard here on weblogs.asp.net. Click on the global settings navigation on the left.
Click on Spam, Ping and Cross-Posting
Under the "Blogs that will be cross-posted to " heading click on "Setup a new blog"
Add the URL which should be of the format
http://otherdomainname.com/blogs/metablog.ashx
Add your APPKey, which is most likely your path after the /blogs/ directory for your other blog, for example, weblogs.asp.net/christoc/ my appkey would be christoc.
put in your username, password, and any message you'd like added onto the bottom of your message. I add a "Posted from Such and Such URL" to all my cross posts. You can use HTML in this area to add a link back to the originating blog.
Any questions, let me know!