Holy Crap Batman!!
I've seen the show about 6 times now, and I'm always impressed.
These guys are hard working, and have a very definite style about them. Teller (the one who doesnt speak during the show) does a great trick with a rose (flower) and a paper playing with the shadows. Its ridiculous, but each time I see this trick I cry my eyes out. Its so beautiful to me.
http://www.youtube.com/watch?v=un1pNtmYguA
If you have seen these guys on Showtime, follow them on satellite radio, or twitter you will want to see these guys in real life. There are no other magicians in Vegas that will get a dollar from me. Its Penn and Teller or nothing!
Check the Rio's website often for discounts. :)
AND always be the last person out of the theater. Heck wait to be the last, go to the bathroom then come out. Penn and Teller meet and greet every single guest. They will take photos, and sign just about anything. And ladies, I hear Teller is currently single ::wink wink::