I have a suggestion for a mod to add to the ones on the guild list:
Persistance of Chattiness (http://www.wowinterface.com/downloads/info5556-Persistence_of_Chattiness.html)
It's a really helpful little mod that remembers the chat channel you were last in. So if you're like me and talk in several different channels (guild/raid/party/general/custom channel for friends in-game) you will automatically resume speaking in the channel you were just in, rather than defaulting back to gchat or /say and having to retype the slash command.
Enjoy! :)
Very similar to Prat. Might want to try that one out too. Pretty lightweight on memory and highly customizable. Even has the ability to remember alts and display the main's name next to the alts when they type in chat.
Screenshots here:
http://www.wowinterface.com/downloads/info7601-Prat2.0.html
Latest version is found here:
http://files.wowace.com/Prat/Prat.zip