JA mentioned namazu wasn't a supported by fink. I have created the package namazu-2.0.17-1.info and updated file-mmagic-pm.info (you need to update file-mmagic-pm because the version in fink is too old for namazu to build).
Download both files, put them in the /sw/fink/10.4/local/main/finkinfo directory (or wherever you put your local fink info files) and run:
fink install namazu
I have submitted the files to fink, so hopefully they will be included in the distribution soon.