wifi is obviously free.
exetel have good data allowances. they use the optus network. exetel.com.au
virgin is also good for data and if you have a lot of mates on virgin then it makes it worth it. check out their rollover plus caps.
Does your laptop have a built in mic? Obviously if you're recording only video, it's not going to listen for input from the mic. Try looking in the settings of the app you're recording with.
Have fun with this one. You need a patched OSX yada yada, pain in the ass really. Guides exist everywhere though. Unsure if it can run it, but VirtualBox is free.
If you're nice to me you can use my Macbook.
They're in the Eng Soc group (search it), they're also in the FEIT group afaik.
Edit: If you haven't joined: http://www.facebook.com/group.php?gid=316721869165 - someone uploaded the shame video :p
I shared your sceptical attitude to begin with. To be honest, I thought it was kind of ridiculous that they tried to turn an engineering camp into an IT camp (and I felt sort of ripped after what the leaders had said about IT camps in previous years :(). Overall it was pretty good just to hang...