Hi, I use FreeRadius 1.0.2 and MySQL, and what I do is a select testing AcctStopTime=0 and the date from the AcctStartTime, so I can view todays online.
Is not the correct solution, but... Perhaps I should move on to 1.0.5, so I can fix this, no? - List info/subscribe/unsubscribe? See http://www.freeradius.org/list/users.html