The format is certainly different from what we've been conditioned to see on MSN Groups. Does Multiply have an indexing feature. similar to that on the left margin of MSN Groups pages?
Since you're getting familiar with Multiply, once you've figured things out, it would be a good idea to summarize the similiarities and differences for us to consider. Just visiting the site for the first time or so -- without knowing how the site's organized -- is more than a little confusing.