Found this announcement that Mohegan will initially be installing a dozen MindPlay 21 tables and may order 138 (!!) more based upon performance.
http://biz.yahoo.com/prnews/040224/latu039_1.html

The chips they use at the MindPlay tables in Reno's Eldorado, the Las Vegas Hilton and the Crystal Bay Club are those plastic thingies so stack your $1's seperately from your bleeding red $5's or you'll end up with the pink dollar "collectors variation"!

Sigh... I guess they can't all be as handsome as this chip.