"If you want Fink to use all of unstable, edit /sw/etc/fink.conf, add unstable/main  and unstable/crypto to the Trees: line, and then run fink selfupdate; fink index; fink scanpackages."

crafterm$ less /sw/etc/fink.conf
..
Trees: local/main stable/main stable/crypto unstable/main unstable/crypto
..
crafterm$ fink selfupdate
<all worked fine as far as i can tell>
crafterm$ fink index
Password:
Reading package info...
W: Couldn't stat source package list file: unstable/main Packages (/sw/var/lib/apt/lists/_sw_fink_dists_unstable_main_binary-darwin-powerpc_Packages) - stat (2 No such file or directory)
W: Couldn't stat source package list file: unstable/crypto Packages (/sw/var/lib/apt/lists/_sw_fink_dists_unstable_crypto_binary-darwin-powerpc_Packages) - stat (2 No such file or directory)
W: Couldn't stat source package list file: unstable/main Packages (/sw/var/lib/apt/lists/_sw_fink_dists_unstable_main_binary-darwin-powerpc_Packages) - stat (2 No such file or directory)
W: Couldn't stat source package list file: unstable/crypto Packages (/sw/var/lib/apt/lists/_sw_fink_dists_unstable_crypto_binary-darwin-powerpc_Packages) - stat (2 No such file or directory)
Updating package index... done.