Wow. That's all I can say is "wow", after looking at your pics. Such an interesting variety of subject matter, and a great "feel" to your photos.
I was in Vietnam last year (July 2009), but after seeing your photos I really want to go back! It was a challenging trip, wife + 2 small kids. My daughter (age 8) particularly didn't like the heat / humidity / pollution. Still, Vietnam was a fascinating place to visit.
BTW I agree -- Hanoi was pretty OK, Ha Long Bay was a major disappointment. Hoi An was interesting (got a suit made, of course) ... particularly liked Da Lat, although maybe that's because it reminded me a lot of Canada LOL!
Anyways, great pics -- thanks a lot for sharing.