The date on the download page has always been the date of the iso file, so if the one you have is an earlier vintage then you got an update. Another thing you can look at is the file size and also the md5 of the file you have. If you have a known good iso and the md5 is different then you got an update. What i'm saying is that you don't really need the version number to tell if you need to download or not.
No, really! After I posted my original query, I went to the download link and it said Feb. 9, 2009. Then when I went back after I downloaded, it said Jan 25, 2009. Anyway, I got 1.01 installed now.