The cookie-based "rememebr me" function provides the username so you -could- leverage the cookie data with yor own solution but it would, of course, only work with people who both have cookies enabled AND who clicked the "remember me" box during a previous login.
 
For people already logged in, you could forward them based on name, userid, user role, etc -- but you'd still need to provide your own solution or buy a module.

I posted a free solution for forwarding logged-in users based on assigned User Roles.  You could adapt this to forward based on other criteria:
 
  http://www.eguanasolutions.com/Default.aspx?tabid=54&EntryID=29
 
Hope that helps-
-mamlin