SEAINT Engineer's Listserv -- An
engineering discussion group that covers many topics, including steel design and
construction. Daily traffic on this list server is commonly between 50 and 100 emails a
day (hint: try the "journal" option if you want to participate, but don't want
so many emails).
Steel-Link Listservs -- There are three
different list servers here, one each for steel detailers, fabricators and engineers. The
steel detailing discussion group is by far the most active of the three with daily traffic
that is commonly between 25 and 50 emails a day. Most people that join one join the others
as well as the topics discussed are generally of interest to all three segments of
interest.
AISC
EDI List Servers -- one for industry types (users), one for software developer types
("producers"). But hey, you can join both if you want too! (-.
Cool List -- Another
list serv for steel detailing.
Steelbridge.org -- the list serv
of the AASHTO/NSBA Steel Bridge Collaboration.