My website (just see the signature below) just got a very high ranking. PR 3.

For me that's high after many months of having 0 and 1 PR.
My question is since I've read a lot of info. about Google getting weird, updating their algothrim, is my PR fake and just temporary? I got a some FEW inbound links from other website, though good ranking. My other pages have 0 PR though.
If this PR is true, once I get a link from DMOZ, will my PR becomes 4 or 5?