Line 29 of my /etc/psad/signatures file:
# $Id: signatures 2129 2007-12-12 04:56:10Z mbr $
As well, at http://www.cipherdyne.org/psad/signatures, it is on line 28.
Dead project? Not sure, but the signatures are old as hell! While I don't think it's a usage deal-breaker, I'm rather surprised. Does it need updated signatures? Probably not, but every little bit helps, especially nowadays. I'd much rather a developer (and package maintainer) be up-front about such things.