I'm waiting for Thai airways prices to come out for October 08. I found a site the other day that had Thai's low seasons for 08 (We fly from Melbourne too)

15 Oct - 20 Sept 07
28 Jan - 30 March 08
24th March - 04 April 08
28 April 0 - 26 June 08
21 July - 18 Sept 08

Cheers Geri