Looking at the pages indexed, I see two issues which Autocrat has
already mentioned (thanks, Autocrat!) that I'd like to expand on:

1. Long & crazy URLs
I ran into this URL while looking at [site:gadgetguy.com.au] :
http://www.gadgetguy.com.au/small-kitchen-appliances-toaster-kettle-c...

Now I'm all for having descriptive URLs, but .... this seems to be
taking it a bit too far and I have a bit of trouble identifying
anything that matches in the content of your page.

The problem with URLs like this is that they almost appear to be
random and in fact I can get exactly the same page by using something
like: http://www.gadgetguy.com.au/xyzzy-42.html . In general, you
should make sure that you have only one URL that leads to your content
-- all others should either redirect to the proper URL or return HTTP
result code 404 to signal that the URL is invalid. Without that, your
site is leading us (and all other crawlers) on a wild goose chase.

If your CMS is not able to handle this properly (one URL per piece of
content), I would recommend not using rewritten URLs so that we can
recognize and skip over unimportant parameters in your URL query
string.

2. Broken HTML code
In general, we try to get it right regardless of what a webmaster uses
on his page. However, there are limits to what we can guess at.
Although this is definitely not as important as the first point, you
can see this happening when you search for something like:
http://www.google.com/search?q=site:www.gadgetguy.com.au+intitle:shor...

Hope it helps!
John