I have just completed a trip in Bangladesh, overland by boat and train from North to South.
Loved it all. although it can be hard going. Only saw 2 other tourists and only in Dhaka. Such a friendly place, highly recomended if you are up for doing it rough.
Although my wife is now in hospital with an unknown bowel disease. Be warned, it is very dirty! more so than any of the other 40 or so countires we have visited. See my blog for pics and journal.
http://www.travelpod.com/members/tsargood