Requests to revive a package work just like any other request for a new package: http://www.debian.org/devel/wnpp/#l1. Like this:
Subject: RFP: dog -- Enhanced replacement for cat
The cat enhancement dog(1) is quite useful and not a big maintenance burden, so I would be happy to see it back in Debian. Version XXXXX from snapshot.debian.org works well for me.
That it is not a big maintenance burden would be especially believable if you promise to look out for bugs and fix them. If you have time for it, http://www.debian.org/doc/maint-guide/ and especially http://wiki.debian.org/DebianMentorsFaq have hints.
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