For the last few weeks, I've been visiting various writing and research groups at Yahoogroups. Most of these lists allow you to ask research questions for your works, and experts or group members will answer them.
Crimescenewriter: Crime Scene Questions for Writers http://tech.groups.yahoo.com/group/crimescenewriter
A large membership with lots of experts and questions. Very mystery oriented. It tends to stay on subject with little chatter.
Most questions seem to be fantasy and historical based. Some mystery questions. Fairly small membership so messages aren't as frequent. Most, if not all, members are writers, not experts. Not much chatter.
Weapons_Info : Weapons Info and Survival
Medium-sized group with lots of experts on mayhem of all sorts. Covers contemporary and historical weapons, etc. Very little chatter off topic. My personal favorite resource group.
Large group specializing in mystery questions. Includes readers as well as writers. I've seen no nonwriter expert replies. Lots of chatter, bickering, sniping, and off-subject discussions as well as discussions on publishing. A heavy traffic list.
Small group that bills itself as a bulletin board for writing-related information. Not much email generated. The same people do most of the posting.
DO YOU HAVE A FAVORITE GROUP? Please let me know.