You've probably heard about the Live Earth concerts around the world on 7/7/07 to "engage people on a mass scale to combat our climate crisis".
Tickets for the Australian show in Sydney go on sale tomorrow morning at 9 am. $99 including public transport to the show. The line-up looks really good.
Vincenze has alerted me to an unofficial Live Earth blog which is quite interesting too, with news and gossip on the concerts (plus some serious environmental news).
Update: Tickets are sold out but I have a couple of spare tickets to the Sydney Live Earth concert if you missed out - drop me a line asap!