Active/Inactive users in stats

[iamdamnsam]

I was checking out a vbulletin forum and they have a count of how many active members they have and how many inactive members.  Pretty cool.  That would be awsome to have for YaBB, especially if you could select the amount of time required to veiw the site to be considered active.  Like 3 days or 7 days, etc.  It would also be cool to have that in the memberlist, showing who is active/inactive.