Very nicely done site. The organization seemed very clear to me, and the first impression was very positive.
I would make the following suggestions:
On the home page, I liked the graphic in the top left module position under "meet the students." It was very colorful and attractive.
If possible, though, I'd love to see it resized to fill the entire module position. The same would be true of the graphic in the middle ("About Mullauna College"). Make it a bit larger (you may have to crop it a bit) to fill the entire module box.
On the logo at the top right, the words "Medley Mag" are in red, and are a bit hard to see in the image. Perhaps changing that text to white would make it "snap" more.
When I click "contact us" I get a page which lists your contact categories. But, you have only one category, so I have to click again to actually see some names.
If you intend to add other categories later, that's find. But otherwise, I would jump directly to the table of contacts and drop the intermediate page.
On the "About Us" page there seems to be some extra white space between the title and the body of the article. You may want to check that.
On a number of these articles, the date is sometime in May 2006. But, they were updated in Dec. 2007. You may want to drop the dates on some of these more generic undated types of content items.
On this page:
http://www.medleymag.com.au/index.php?o ... &Itemid=75 the photo seems to have been resized, but the proportions are not correct. You may want to check that as the photo seems a bit stretched.
Again, these are just suggestions. You have done a very nice job with the site.