Please change my project download link

The table will not show alpha/beta/rc releases when you have a previous stable version that exists (in your case 3.0) until you actually make a 3.1 official release.

If you want to go through a beta cycle and have it shown on the project page you would need to create a new branch.

I made a 3.0 branch

That was probably a mistake. 6.x-3.0.x is not a valid branch format afaik http://drupalcode.org/project/fb.git/tree/refs/heads/6.x-3.0.x

that's where I made the 3.0 tag

ok.

The 3.x branch is where I tagged the 3.1 beta. Ideally, they would both show on the project page. Is there documentation how to do it correctly?

You've taken the numbering one level deeper than it's supposed to. You should have created a 6.x-4.x branch and your "3.1 beta" should be a "6.x-4.0-beta".

See also #647428: Show latest prerelease (if different from recommended release) with dev releases

@Dave Cohen - of course they are and of course there is, but it was a design decision/limitation at this point that they can't.

I think it matches the philosophy that the "3.1" release is a bugfix release on top of 3.0 and therefore shouldn't really need a beta. If you like the beta so much more, you should just make it the 3.1. If it has bugs, fix them in a 3.2.

I think your comment on the other issue explains this perfectly: " If I could delete that damn 3.0 release (the node on d.o, not the code), I wouldn't have that problem."

If you delete the 3.0 then people will be strongly encouraged (via update_status, and initial downloads) to upgrade to 3.1-beta. So...just make 3.1-beta your 3.1 code and be happy.

Right. If 3.1-beta is so much better and more stable than 3.0, it should just be 3.1. If it's not better than 3.0 then it shouldn't be what people are encouraged to download and use.