I needed to download the CLI tools within Xcode, and it needs to be done before installing MacPorts -- otherwise you'll need to re-install MacPorts. So I launched Xcode and went to "Preferences > Downloads" and clicked install on "Command Line Tools"

Installed MacPorts from the dmg package on googlecode, but got this error:

When looking for what can be uninstalled to reclaim space:

rpm -q -a --qf "%10{SIZE}\t%{NAME}\n" | sort -k1,1n

Sample output:

51721748 boost-devel
57180821 wireshark
65074768 libgcj
71492413 db4-devel
79152667 valgrind
85414200 java-1.6.0-openjdk
108920679 kernel
112425302 glibc-common
115976633 squeezeboxserver
116424867 kernel
116467238 kernel
204226588 fluid-soundfont-lite-patches