Hilton E-mailed me an apology - same day. Happy to share it:
Yes, that was another issue I discussed with our Internet Development Team. Hopefully that will be corrected next week when a new server is installed. I can not apologize enough on our behalf. We do however appreciate your patience and continued patronage. Should you find the site down, please feel free to call our Internet Reservations Hotline at 800-774-1500. We have a dedicated staff that can assist you with making reservation at any Hilton Hotel.