Maya: Australia is pretty sweet (I hear New Zealand is pretty rad too, never been thuogh. Paul might be able to tell us )
Browsers on the iPhone other than Safari run with less privileges than the native browser I think, though I suppose they would give a decent enough browsing experience. (Though like you said, drop shadows don't look good, so maybe it doesn't get access to hardware rendering.)
I think one of the issues with a lot of newer sites is that people tend to only use the -webkit- CSS prefix and the no-prefix version of CSS properties, which results in some browsers like older Mozilla, Opera, Opera Mini, etc to not show the property properly. We had a discussion about it in the CSS forum a while back.