In Reply to: Not when travelling B/class but posted by peedee on Tuesday, 3. April 2012 at 11:02 Bali Time:
Jetstar has two levels of business class now. The cheaper level does not include lounge access. It's around $200 extra to the next level of business class which only gives you lounge access plus frequent flyer points over the lower level.
Last August I flew Jetstar b/class and got lounge access at Sydney in the Qantas lounge and coming home in the Premier lounge.
Premier lounge is US$25 per person to buy into. Not worth that much, from my experience last August.