There are some custom login modules that allow redirection to a specified URL.
Signallogin
extensions.joomla.org/component/option,c...4181/Itemid,35/ 
; which RT used in the latest template download for
Perihelion allows this redirection on login.
www.rockettheme.com/option,com_docman/ta.../gid,185/Itemid,113/
Community Builder (CB) also has this ability.
The new 1.2 version (to be released soon) has many features you might be interested in too.
www.joomlapolis.com/
Thanks very much for this Joseph! Will look into those links.