Further links that provide information for the traveller and tourist: 

www.destinationoman.com
http://www.omanholiday.co.uk/tours.htm  
World Travel Guide: Oman by Columbus Group, gives comprehensive information on all aspects of travel to Oman
Destination Oman by Atevo Inc., also trying to provide everything the Oman tourist needs
Oman Tourism by Legend LLC is a very general overview about Oman's tourist attractions
Oman Tourism is a similar overview by Oman Infoworld (Inforamp)
U.S. Consular Information Sheet on Oman (last updated 9 May 1997)
TravNet! Oman Menu
Travellers Tips to Oman by Tiglion Consultancy Co., also at http://www.travel.com.hk/oman.htm
INFOHUB Oman Travel Guide
General tourist information: Oman
Tourism information by oman.on.line
Omani Diplomatic and Consular Missions abroad by the Ministry of Information
Embassies of Oman by Embassies Worldwide (Erik de Jong)
Zubair Tours: treasures of Oman - gives some ideas about what to see in Oman
Oman Tourist by New Horizon Internet Services, lists addresses/phone numbers for hotels, restaurants, airlines, car rentals, tour operators, shopping, etc.