Or homebrew http://mxcl.github.com/homebrew/
brew install dpkg
The macports version has many dependencies and takes forever.
If all you want to do is see what is in the package, then remove and unlock it.
ar -x package.deb
Then you must have the debian version, control.tar.gz and data.tar.gz in your current directory. The files that will be added to the package will be in data.tar.gz. The package description will be in a file called control inside the control.tar.gz file.
tar -tvzf data.tar.gz
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