You can have access to all messages that www.grouply.com downloads from Yahoo! Groups
They call it Dyanamic User Profiles. You can create one from any user in Grouply, even if they are NOT part of your group.
Here it is in their own words:
Dynamic User Profiles
Grouply provides dynamic user profiles that let’s you find other people with similar interests. You can see what groups you have in common and discover new groups to join.
You can find interesting messages by looking at what they have bookmarked or viewed recently. You can discover their “point of view” by reading their “blog”, automatically compiled from messages they posted.
And because the user profiles automatically update with new activity, there’s always a reason to come back to see what’s new. As a user, you have complete control over what you show in your public profile.