Willie Mays, Robinson Cano, Trevor Plouffe.
Nick Swisher NYY
Robin Yount - Milwaukee Brewers
Melvin Mora on the Baltimore Orioles is the only one that I know of.
Mookie Wilson
Jose Reyes
Anderson hernandez
According to http://www.cubsbythenumbers.com/cubs-all-time.html, no Cubs player has worn jersey number 66.
Galen Fiss
Roosevelt Riley
Meow and meower
Chris Snee
lester borden