This website shows you how to "soup up" your
Palomino's
http://www.modfatha.net/unlocking_athlon_palo.html

T'bred and Barton
http://www.modfatha.net/unlocking_athlon_tbred.html

and convert an XP into an MP
http://www.modfatha.net/xp_mp.html

Good stuff...I love sites like these...