64 bit computer?

I bought my MacBook in March, the latest at that time Unibody Macbook. My question is does this computer function as a 64 bit machine? In other words, if I run 64 bit programs am I getting the speed boost those programs offer?
Thanks

Glen....read this....
http://www.zdnet.com/blog/apple/will-your-mac-boot-64-bit-snow-leopard-by-defaul t-not-unless-its-an-xserve/4712
....at this time no MacBook will boot into 64 bit mode...but the 64 bit apps work fine in 32 bit mode....

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