Previous versions of Xcode... advertised anywhere?

Question

People seem to be coming up with links to download previous versions of Xcode (which I used here). Is there a page on apple.com that advertises these, or is this just secret knowledge?

Answer 1

Newest Xcode

old versions from old site (under developer tools) (requires login/registration): long link

EDIT: Here's a fun article that shows you how to do it as well

Answer 2

URL: <http://connect.apple.com>; login; click "Downloads", "Developer Tools".