There are many mailing lists that you can subscribe to through Rootsweb. These mailing lists are all free and you can add queries for your research. There are mail lists for regions, states, counties, and even some surnames.
An important note...there are two types of mail lists: list and digest. The list mode is a list that will generate an email to you everytime someone has posted to the list. If you do not want your inbox full of messages to sort through, you can try the other mode which is digest. The digest mode is the best option for those of us who do not like to sift through messages. In the digest mode you can quickly see which type of queries are posted for several days and pick which messages you want to view.
For more information about mailing lists through Rootsweb, please click here.
Here are some examples of mailing lists: