Zach (Key West), who we haven't heard much of, recently sat down and blogged about the Real World Sydney. The article has a little picture of him that shows that he got a new haircut in which he looks like he's a completely different person. Other than that, he's scheduled to be on the upcoming Gauntlet 3. Since the show ended, Zach has been taking the time to produce his own movie, so I'm sure you will be hearing about that a little more as time goes on.
In the article, he gives you his opinion of each of the new roommates. Most prominently however, is the fact that he refers to himself now as "Issac", which may be his real name, and he may have used his nickname when he was on Key West.
Nevertheless, read the blog. it's a good read.