I reported this to Apple over a month ago, but it hasn't been fixed yet.
Don't know why the links for iTunes were removed, but it's possible that Apple had a fallout with OldApps, or they somehow violated Apple's terms of service.
Regarding OS 9 update downloads, since the moderators accepted my 'tip', it's likely that the links are 'involuntarily' broken; i.e. are the servers near the Fukushima plant in Japan? Maybe the server is temporarily offline.
Considering the rising popularity of Apple products and growing interest from the general public, I think it would be in Apple's best interest to make it as easy as possible for people to download the software needed to use their products, even if it meant using an outdated operating system or software. Someone walking around with Apple products is free advertisement for the company. I know people that would be impressed by a machine running OS 9 just for the fact that it is a Mac.
Anyway, any old versions of iTunes that are still on the Apple are easily downloadable by going here: http://support.apple.com/downloads/#iTunes
For example, if you wanted iTunes 9.2.1 for OS X 10.4, you would type it in the Downloads search box, which would lead you here: http://support.apple.com/downloads/#itunes%209.2.1 and click on the first result.