Heyy...three of us tpunks did 'Nambodia over Christmas last year. I'm going to start with a whole bunch of random links.
Here's our
meetup thread if you want to see what we did.
Here are some
journal entries from Cambodia that I posted on tpunk. And my
Cambodia photos, and my
Vietnam photos, so you can get an idea of what we saw. And the
tpunk meetup photos, so you can see what we drank.
Okay, that being done with...I did enjoy Vietnam and Cambodia muchly. Vietnam was a lot more touristy than I thought, though. It does make it easy to get around, but harder to get off the beaten track. We also had crappy weather, but that shouldn't be an issue since you're going mid-year - which is when I want to go back to Nha Trang and go diving someday!
Cambodia turned out to be slightly more pricey than I thought - partly because they use US currency for everything, and the local notes function as change. If I redid my trip, I would've probably allocated more time for Cambodia so I could've seen more than just Phnom Penh and Siem Reap. It's very obviously poorer than Vietnam, but it was chiller and I kind of liked it better there. Angkor is definitely worth a hit, although we got templed out pretty quickly.
Not sure what you want to know, but feel free to ask. You know I love SEA and it's affordable and always an amazing experience...I got by on about US 20 a day with more drinking than I ever intended to do, and I actually have a ridiculously OCD-detailed expenditure listing for Vietnam if you ever want to see it.