Or MacPorts [1], or Homebrew [2]

[1] http://www.macports.org/

[2] http://mxcl.github.com/homebrew/

Quite not the same (full distro repository vs small amount of ported apps). Easier and useful, though.

Small is not quite exact. MacPorts has 8,000+ ports. Homebrew has 1600+ formulae but this is an awful metric due to the distributed nature of its development (2000+ forks, with some very specialized) and it is barely two years old!

Take the package count for Debian as a reference: http://ftp-master.debian.org/users/joerg/pkg-nums