Mike:
Day 1: The bus trip to Thailand from Cambodia wasn't as smooth as from Vietnam to Cambodia.
The bus was late and we were waiting at the bus station for nearly an hour until we eventually left from Siem Riep at 8:30am. The Cambodian side of the trip took only 2 hours. When we got off, we joined the queue to leave Cambodia, but once on the other side we joined another substantial queue for Thai visas. This queue took around 1.5 hours. Finally with our visas sorted we had to wait on the Thai side for everyone else to complete their visas, so the whole thing added another 3 hours onto our journey time. Once we had enough people we hopped into a packed minibus and headed off. Before we could get very far though a couple next to us were so unhappy by how cramped it was, called for the driver to stop and just got out and left, much to the dismay of the driver. After insulting them (our hated word "Lao wa" was used again) he then spent time on the phone ringing various people. Their leaving was actually great for us though as we had much more space.
We did eventually set off again and settled in for a 3+ hour journey to Bangkok. On the way we stopped to refuel only to discover that the petrol had run out at the station and they were waiting for more to arrive. Our driver didn't want to keep going to another station, so this meant hanging around in the petrol station for about 1.5 hours. Good fun....
By the time we got petrol the queue for the petrol station was huge, so at least we got there when we did (God knows how late the 2 that got off our bus would get to Bangkok now).
We continued with our journey and eventually arrived in Bangkok after dark. We got off at one of the stops and jumped straight on the busy metro rail (it was around 6pm) until we changed to the airport line. Following the instructions of the hostel we got off at the station before the airport and got a 40baht taxi to the hostel.
After we checked into our dorm room we were about to head to bed early, the days travelling had taken it out of us, plus we had an early flight (but at least we were now close to the airport). However, we were chatting to the receptionist and mentioned we were flying with AirAsia, he looked a little pained by this then explained that there was another airport in Bangkok and AirAsia now flew from there. The other airport was on the other side of Bangkok (I felt like a right muppet for booking an airport hostel next to the wrong airport). There was then much debate as to whether we could get the free shuttle bus between airports, but concluded that the bus service started too late and we wouldn't make our flight.

Day 2:
No air con in the room made it uncomfortably hot in the room at night so after little sleep, we got up around 4am, quietly showered and headed outside to grab a taxi across Bangkok. The taxi took 45 minutes and was 250 baht. But at least we made it to airport in good time which allowed for a relaxed check in and security checks ready for our flight to Surat Thani at 7am.