Brew. Its basically a package manager that installs things the 'apple way' and won't clobber system libraries like fink, or macports. Its really easy to install:
Brew lets you install all kinds of things: (like ntfs support!), htop, encfs (for encrypted on the fly dropbox encryption), REAL bash, as SYMLINKS in your /usr/local directory, and won't clobber things when updating. I love it.
ruby -e "$(curl -fsSL https://raw.github.com/mxcl/homebrew/go)"
Brew, when macports drives you to drink.