Since we trekked with him up Half Dome, our guide, Doug Skiba, has moved to Colorado and now works for the State Department of Conservation. The Yosemite Mountaineering School continues to lead trips and provide outdoor training, equipment and experiences of all kinds.
For complete information and tips on hiking safely to the top of Half Dome, I suggest you consult One Best Hike: Yosemite's Half Dome (Wilderness Press) and visit http://www.HikeHalfDome.com
Our own Rick Deutsch, moderator of the ActiveAdventures Forum, is our Half Dome guru, and has written this comprehensive guide to Half Dome.
There is also a wealth of information about hiking Half Dome (and thousands of other adventures) available from our good friends at EveryTrail.com