Planning For The Heart of Cambodia

The planning was easy for "The Heart of Cambodia" since it was a group tour. Did some googling to dig up some of the latest information on Cambodia...always visit the Lonely Planet...Fodor's...Frommers...Cambodia Government site.
Air? We flew Chicago to Bangkok via Tokyo on United (our airline of choice). You have many, many airlines to pick from since almost every major airline flies to Bangkok. From there, it is an easy one-hour flight on Thai Airlines. Some of the other airlines currently flying into Cambodia are: Bangkok Airways, China Southern Airlines, Dragonair, EVA Air, Lao Airlines, Malaysia Airlines, Mekong Airlines, Shanghai Airlines, Siem Reap Airways International, Silk Air, Royal Phnom Penh Airways, and Vietnam Airlines. There are definitely enough to choose from.
Hotel? The tour didn't start until Sunday but we flew into Bangkok two days earlier. Tip: Always plan on arriving at least one day before your trip starts in case of weather delays, cancelled flights, etc. United lands around 11:30pm...you don't arrive at the hotel until perhaps 1:00am...and we've found it impractical to pay perhaps $200+ for the rest of that night to stay in a luxury hotel. We picked the Grand Mercure Park Royal. Have stayed here before, like the Sukhumvit area, rates are reasonable, they have a wonderful buffet breakfast, and it's near the sky train.