I do not want to be condoning piracy but I do know these are very popular with backpackers. For US$5-US$10, you can bargain hard for pirated coloured copies of "Lonely Planet" guides - usually of Cambodia and the neighbouring countries like Thailand, Laos, Vietnam, Malaysia & Singapore. The quality ain't bad - and you save a lot of money compared to the originals but I leave it to you as reader of this tip to make a judgement call for yourself with regard to respecting copyrights.
Just be beware of claims from stallowners that these guides are the original.
If you come here in June - september, you will probably find some rains everyday, specially in the afternoons.
So bring an umbrella - anorak and carry it always with you. It might be very useful if a sudden rain gets you while you are temple visiting or riding on a motorbike...
Or injured, for that matter - medical facilities in Siem Reap are pretty basic - no big hospitals here. If you get something seriously wrong with you evacuation by air to Bangkok is your best bet - make sure your travel insurance covers you for this eventuality.
The whole town is dusty. Fine sand and dust littered the entire town. It's the first thing you see, you smell and you feel. Be prepared for a dust bath.
If you can call those roads highways, in Highway 6 you can find here and there cows and other animals crossing the road, so be careful if you rent a car!!