Okay, I want to
http://www.versiontracker.com, I click "Developers" in the top right and I am taken to a screen with a white box headed "Developer Connect" and a blue sidebar with a "Sign Up Today!" box and a "Developer Login" box. I put my details into the login box and click "Login". I am taken to a much whiter screen on secure.versiontracker.com that reports "Invalid e-mail address or password". I reenter my details in the boxes there and click "Login" and am taken back to the previous blue/white screen. Now, however, the top right of the screen says "ThomasHarte | My Account | Logout", implying that I logged in successfully. But the blue sidebar is still just "Sign-Up Today" and "Developer Login".
Suspecting I might have some sort of non-developer account set up for which I need to request additional privileges, I tried again to "Sign-Up Today" through the blue sidebar on Version Tracker. After clicking the confirm link emailed to me I get a page telling me that email confirmation has failed and the wonderfully meaningful error:
dbconnection Object ( [errno] => 0 [errmsg] => [_link] => [_linkMaster] => [_linkSlave] => [_useReplication] => [_db] => )
It's like using Windows all over again! I guess I will try again in a few days. In the meantime - MacUpdate all the way!