Surprised this hasn't been posted yet. Always handy to be able to refer to these later so you can evaluate the likelihood of sales at the same time next year :-) Also applies to "connecting" jetstar flights, eg I was able to get from Adelaide to Bangkok via melbourne on the same ticket using sale fares.
Note that
On sale until 1 November 2010, but likely to be extended.
Domestic Fares:
Adelaide Brisbane 24 Jan - 12 Apr 2011 $69
Adelaide Cairns 24 Jan - 12 Apr 2011 $89
Adelaide Darwin 24 Jan - 29 Mar 2011 $89
Adelaide Melbourne (Tullamarine) 24 Jan - 5 Apr 2011 $39
Adelaide Gold Coast 1 Feb - 12 Apr 2011 $79
Adelaide Perth 1 Feb - 12 Apr 2011 $79
Adelaide Sydney 24 Jan - 5 Apr 2011 $59
Brisbane Cairns 24 Jan - 12 Apr 2011 $79
Brisbane Darwin 24 Jan - 29 Mar 2011 $139
Brisbane Hamilton Island 24 Jan - 12 Apr 2011 $49
Brisbane Launceston 1 Mar - 12 April 2011 $64
Brisbane Perth 24 Jan -12 Apr 2011 $129
Brisbane Melbourne (Tullamarine) 24 Jan - 5 Apr 2011 $79
Brisbane Mackay 24 Jan - 12 Apr 2011 $39
Brisbane Newcastle 24 Jan - 5 Apr 2011 $39
Brisbane Whitsunday Coast 24 Jan - 12 Apr 2011 $49
Brisbane Sydney 24 Jan - 5 Apr 2011 $49
Brisbane Townsville 24 Jan - 12 Apr 2011 $69
Cairns Darwin 24 Jan - 31 Mar 2011 $89
Cairns Melbourne (Tullamarine) 24 Jan - 5 Apr 2011 $99
Cairns Gold Coast 24 Jan - 12 Apr 2011 $59
Cairns Perth 24 Jan - 12 Apr 2011 $139
Cairns Sydney 24 Jan - 5 April 2011 $79
Darwin Melbourne (Tullamarine) 24 Jan - 5 Apr 2011 $74
Darwin Sydney 24 Jan - 5 Apr 2011 $109
Hobart Melbourne (Tullamarine) 1 Mar - 6 Apr 2011 $49
Hobart Sydney 1 Mar - 6 Apr 2011 $59
Launceston Melbourne (Tullamarine) 1 Mar - 6 Apr 2011 $39
Launceston Sydney 1 Mar - 6 Apr 2011 $59
Melbourne (Avalon) Brisbane 24 Jan - 5 Apr 2011 $49
Melbourne (Avalon) Sydney 1 Feb - 5 April 2011 $35
Melbourne (Tullamarine) Gold Coast 24 Jan - 5 Apr 2011 $59
Melbourne (Tullamarine) Hamilton Island 24 Jan - 5 Apr 2011 $79
Melbourne (Tullamarine) Newcastle 24 Jan - 5 Apr 2011 $39
Melbourne (Tullamarine) Perth 24 Jan - 5 Apr 2011 $129
Melbourne (Tullamarine) Sunshine Coast 24 Jan - 5 Apr 2011 $69
Melbourne (Tullamarine) Sydney 24 Jan - 5 Apr 2011 $45
Melbourne (Tullamarine) Townsville 24 Jan - 5 Apr 2011 $79
Melbourne (Tullamarine) Ballina Byron 24 Jan - 5 Apr 2011 $59
Newcastle Gold Coast 24 Jan - 5 Apr 2011 $39
Sydney Ballina Byron 24 Jan - 5 Apr 2011 $49
Sydney Gold Coast 24 Jan - 5 Apr 2011 $39
Sydney Hamilton Island 24 Jan - 5 Apr 2011 $69
Sydney Perth 24 Jan - 5 Apr 2011 $129
Sydney Sunshine Coast 24 Jan - 5 Apr 2011 $49
Sydney Townsville 24 Jan - 5 Apr 2011 $59
International Fares
Brisbane Christchurch 1 Feb -6 Apr 2011 $119
Brisbane Denpasar (Bali)
via Darwin 1 Feb - 29 Mar 2011 $269
Brisbane Honolulu
via Sydney on Jetstar flights only 1 Feb -31 Mar 2011 $415
Brisbane Phuket
via Sydney on Jetstar flights only 1 Feb -31 Mar 2011 $355
Cairns Singapore
via Darwin 1 Feb -31 Mar 2011 $199
Cairns Osaka 22 Mar - 20 Jul 2011 $199
Cairns Tokyo (Narita) 22 Mar - 20 Jul 2011 $229
Darwin Denpasar (Bali) 1 Feb -31 Mar 2011 $149
Darwin Ho Chi Minh City 1 Feb -31 Mar 2011 $149
Darwin Singapore 1 Feb -31 Mar 2011 $119
Gold Coast Auckland 1 Feb -6 Apr 2011 $129
Gold Coast Christchurch 1 Feb -6 Apr 2011 $129
Gold Coast Denpasar (Bali)
via Sydney on Jetstar flights only 1 Feb -31 Mar 2011 $319
Gold Coast Osaka 22 Mar - 7 Apr 2011
26 Apr - 29 Jun 2011
19 Jul - 31 Jul 2011 $299
Gold Coast Phuket
via Sydney on Jetstar flights only 1 Feb -31 Mar 2011 $329
Gold Coast Queenstown 1 Feb -6 Apr 2011 $119
Gold Coast Tokyo (Narita) 22 Mar - 7 Apr 2011
26 Apr - 29 Jun 2011
19 Jul - 31 Jul 2011 $299
Melbourne (Tullamarine) Auckland 1 Feb -6 Apr 2011 $109
Melbourne (Tullamarine) Christchurch 1 Mar -6 Apr 2011 $149
Melbourne (Tullamarine) Bangkok
Direct Flights only 1 Feb - 31 Mar 2011 $249
Melbourne (Tullamarine) Denpasar (Bali)
Direct Flights only 1 Feb - 31 Mar 2011 $299
Melbourne (Tullamarine) Fiji (Nadi)
via Sydney on Qantas flights (Jetsaver only) 1 Feb - 31 Mar 2011 $275
Melbourne (Tullamarine) Honolulu
via Sydney on Jetstar flights only 1 Feb -31 Mar 2011 $399
Melbourne (Tullamarine) Osaka
via Gold Coast on Jetstar flights only 22 Mar - 7 Apr 2011
26 Apr - 29 Jun 2011
19 Jul - 31 Jul 2011 $395
Melbourne Phuket
via Sydney on Jetstar flights only 1 Feb -31 Mar 2011 $339
Melbourne (Tullamarine) Queenstown
Direct Flights only 1 Feb -6 Apr 2011 $129
Melbourne (Tullamarine) Singapore
Direct Flights only 1 Feb -31 Mar 2011 $249
Melbourne (Tullamarine) Tokyo (Narita)
via Gold Coast on Jetstar flights only 22 Mar - 7 Apr 2011
26 Apr - 29 Jun 2011
19 Jul - 31 Jul 2011 $395
Perth Denpasar (Bali) 1 Feb - 13 April 2011 $149
Perth Jakarta 1 Feb - 6 Apr 2011 $149
Perth Singapore
Direct Flights only 1 Feb -13 Apr 2011 $159
Sydney Auckland 1 Feb -6 Apr 2011 $119
Sydney Christchurch 1 Feb -6 Apr 2011 $129
Sydney Fiji (Nadi) 1 Feb -31 Mar 2011 $169
Sydney Denpasar (Bali)
Direct Flights only 1 Feb - 31 Mar 2011 $299
Sydney Honolulu 1 Feb - 31 Mar 2011 $359
Sydney Ho Chi Minh City
via Darwin 1 Feb -31 Mar 2011 $249
Sydney Osaka
via Gold Coast on Jetstar flights only 22 Mar - 7 Apr 2011
26 Apr - 29 Jun 2011
19 Jul - 31 Jul 2011 $349
Sydney Phuket
Direct Flights only 1 Feb - 31 Mar 2011 $299
Sydney Tokyo (Narita)
via Gold Coast on Jetstar flights only 22 Mar - 7 Apr 2011
26 Apr - 29 Jun 2011
19 Jul - 31 Jul 2011 $339
20010? I'd better get in early then! :)