Just came back from a 7 days trip and here are some feedback that might be useful to fellow travellers.
1. Transport from airport: After reading about the hassles over taxis, I decided to try the public bus no. 152. It worked as one poster said. Just turn right upon exit and walk 5 minutes to the domestic terminal. You can see the terminal even before starting off. The bus will stop directly in front of the domestic terminal. If it is not waiting there, just wait for a few minutes. The fare is only 3000 VD (about 0.20 US cents!) A side window will show the road names served and it is very easy to follow its progress because all street corners are well named. At Pham Ngu Lao, it has a stop directly opposite the backpackers' lane. Otherwise you can take it all the way to Ben Thanh market.
2. Going to Binh Tay market. This is just off the tourist map at the lower left hand corner. I was worried about being lost but it is actually very easy to get there. Just take bus no 1 from Ben Thanh market. It serves the two markets end-to-end. Bus fare again only 3000 VD. At the terminal, look for the gate where the buses exit. The market is visible at the opposite end of a short street.
3. DVDs: The cheapest are at Huynh Thuc Khang, 5 minutes walk along this road from Ben Thanh Market. Many many shops here. Example of prices: 50,000 versus 80,000 elsewhere. A bit puzzled whether these are legal because they are nicely produced and packaged 7 to 8 movies in one disc and also sold in good class shopping mall.
4. Day tours: A half day Cu Chi tunnel tour cost me US$6 when booked at the hotel but only US$5 if you go to the tour office directly. Tour prices vary so unbelievably if you compare expensive ones with those near the backpacker's lane. A 1-day Mekong tour cost only US$8 with lunch plus several trips on different types of boat. Cost of living is so amazingly low!
5. Sudden tropical rain: Those living in the tropics know how these are like. The torrent comes quite suddenly and places get badly flooded. If you are wearing shoes, be prepared if it is your only pair. Most locals wear sandals.
6. Pho24 etc: When they realise that you are a foreigner, some charge you for the disposable hand towel and the fried dough that they put on your table even if you did not order it. (The one at the west side of Ben Thanh market did this). Then they charge you for it. Sure, it is only a few cents but you get the idea.
7. Crossing the road: A most unnerving and unique experience! The trick is to move very slowly. Never make sudden moves. The endless swarm of motorcycles will skillfully avoid you. Some first time visitors even stand at street corners to admire how the traffic works!
8. Being approached: After reading about all the scams, I ignored everyone who approached me. You get approached by all kinds all the time, especially the cyclos. Nothing good seems to have been written about them. Even though if you are an Asian, they seems to know who are the foreigners. I think the advice and experience of fellow travellers about these scams are worth taking note of.
9. The War Remnants museum: Although I had seen the days of Maoist insanity and both my parents (from huge extended families) are the only ones who escaped, it is educational to see the suffering on the other side and why war has no moral.
Hope these points are helpful.