You still didn't tell me what you thought of 28 days yet...
Ok, I'll just list some songs by local artists I've liked and have done well - they are different to American music, they're generally less producted, more "raw" if you know what I mean... anyway...
Frenzal Rhomb - Never Had so much fun (good lyrics

)
Spiderbait - Calypso
Grinspoon - Black Friday (bit heavier but good headbanging stuff

)
That'll do you for now hehe I should get into the pop stuff too there's quite a few good local pop artists too...