The MacBook Pro gets hot, so hot you can cook on it. Jokes aside it is a problem but I found a really great solution. I purchased an Antec NoteBook Cooler and moded it for the MacBook Pro. The trick is to remount the front 2 feet on the back of the top of the cooler. Typically the MacBook Pro will create a vacuum against the 2 large USB powered fans and make it ineffective. By moving the bottom front feet to the top back, it slightly elevates the MacBook Pro and pulls the heat from the machine effectively. Basically the MacBook is angled on the cooler to remove the heat better.
I have found this setup is so good that it actually makes the notebook run noticeably faster. I run the notebook all day every day and it never gets hot, not even warm. The case of the MacBook Pro is like a big heatsink, all it needs is an external fan to pull the heat away.
Trust me you will not regret doing this. Ok back to work.
Cheers,
Ted :)
DIGG IT! 
Ted, thanks for posting this. I had just bought this very antec cooler a while back.
The best way to cool your MacBook is what I did a few weeks ago while in Seattle. Take it to the front of a ferry at night and let the wind blow on it. (I was using a GPS)
I got it down to 85 F. :P
Thanks for the tip, Ted. Would it be possible to post a photo of your modification? I'm not quite able to visualize what you did.
ditto to that - a photo would be dandy! Just ordered a macbookpro and can't find a decent cooling option :o)
Ditto, it'd be great to have a photo...I'm considering buying one and would love to see how to set it up. Thanks for the tip! Stephen
How about the ibreeze.
http://www.macmice.ca/itoolkit.asp?pg=products&specific=jnlnpni8
I bought a Targus Notebook Chill Mat and my macbook pro does not get hot anymore. Thanks for the tip!
Watch this!
http://www.pcsilenzioso.it/forum/showthread.php?t=6281