I've been researching headsets for Macs. Here are two which are highly rated. Note that Macs need an adapter to use a headset microphone in many cases. This is explained in the first link. http://www.macworld.com/article/133360/2008/05/beyerdynamic_mmx2.html http://www.cnet.com.au/logitech-premium-usb-headset-350-240064145.htm
This website explains how to set up a Mac client for Ventrilo. Ventrilo (also called Vent) is one of the two most used programs that allow in-raid chat. Teamspeak is the other. Note that your guild's server may need tweeking of its Ventrilo codec.
http://mdpull.blogspot.com/2008/06/ventrilo-on-mac-setting-it-up.html
This site compares Teamspeak and Ventrilo. http://forums.whirlpool.net.au/forum-replies-archive.cfm/963538.html
Many thanks to CD and King J for help.
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The Solo MMO Player collects links to the most useful or interesting MMO websites, databases and blog entries I have found, with a bias toward topics of interest to the Solo Player. Use the search box in the upper left hand corner to find topics. Kelari NPC Warrior art courtesy of Game Fluid.