I'm pretty sure everyone here loves their cheap SE Asian getaways and now Air Asia is offering what seems like a pretty awesome deal for tourists who want to fly around a few countries. They have a new system where you can pre purchase "Credits" for flights in bulk and then redeem them for different flights. Lots of flights are 1 credit and some are 3 credits so you should get a minimum 4 flights and possibly 6 or more (10 is possible but would be pretty restricted) for your 10 credits. Note you still have to pay taxes and baggage isn't included but taxes in particular are quite cheap at SE Asian airports.
The cost is $499 Malaysian Ringits (~$175 AUD) for 10 credits with 30 days expiry or $888 MYR (~$313 AUD) for 20 credits and 60 days expiry. The expiry date is measured from the time of the first flight so you can book now and the 30 days doesn't start until you take your first flight. You have 1 year to book the first flight before it expires.
There is heaps of information on how it works in the deal link.
And please refrain from to many comments about their recent crash in Indonsesia, they fly hundreds of routes a day and have some of the most modern planes in Asia.
Sounds like great value but redemption is via Bigshot login instead of their normal flight booking procedure. This means they can restrict seat availability any which way they like. Chances are that you'll be flying unsociable hours during peak seasons.