Origin Energy - 1.5Kw Solar panel system for $1.5k installed [with luck! ;-) ]
The big carrot is that you only pay $299 initially, then three months after it's installed you pay $112.12 per month for 24 months. So that's basically an interest free loan for two years.
Now the total cost therefore is $2,990 and you can get similar deals around, but generally not with the interest free payments. I'm taking a small liberty with the whole "1.5Kw for $1.5k" thing, but bear with me - by my reckoning my 1.5Kw system is going to pay itself off in about 4 years (in Melbourne with a bit of luck/string of sunny days) due to the feed in tarrif here & my usage patterns. Assuming that's the case, then if I'd got mine via this deal then in two years it would have generated about $1,500 in savings (by generating power for me to use, and by feeding power back into the grid that then gets credited back to me at a premium) and paid $2,990 for the system so all up the system would have cost me $1,500. In another two years it would have paid that back and from then on the savings would go straight to my bottom line.
Obviously you would need to check out your usage patterns yourself, and the return on investment will vary on your location, feed in tarrifs, which way you house faces, and other factors. Your ROI might be quicker in some locations, or much worse (eg in Tassie or if your roof is in shadow from trees).