A new addition to the SportsBLOGS cartel is Amazin' Avenue, a Mets blog. Check it out. Some players that have played for both teams in the past 20 years, off the top of my head:
Gary Carter
Darryl Strawberry
Armando Benitez
Tyler Walker
Kevin Mitchell
Jeff Kent
Edgardo Alfonzo
Shawn Estes
Add to the list. Cheaters get sent to the circle of hell where eternity consists of nothing but a Willie McGee kissing booth at the county fair.