Just a replay of http://www.keil.com/forum/17710.
Summary: The old Keil Chip Parameter search was dropped by Keil but still exists at http://www.keil.com/dd/search_parm.asp as pointed out by Jon Ward. It is no longer updated but still exists.
A replacement was suggested at www.embeddeddeveloper.com. This appears to have been recently updated and expanded . It is an excellent resource for chip review and selection as well as software tools.
Bradford