I found HHN and conservativenet.com from that search. Interesting stuff. I'm relatively new to online conservative activism and I'm glad to find them. Something tells me I prefer the FR format, though.
H-conserv is really for academics, and it runs through a (good) moderator but it lacks the fire of FR and also is VERY slow. Moreover, because it IS mostly academics, many don't want to say anything that is too controversial for being "outed" as "real" conservatives. So they tend to be a quiet bunch.