I created that feed back when we had the .NET 3.5 version of mojoPortal in the Web App Gallery, but now that we have the .NET 4 version we don't really need that feed since you can get the latest .NET 4 version from the Web App Gallery. If you prefer other versions you can download them from our codeplex page, all the packages are msdeploy packages.
I "might" make an updated feed at some point but its a bit of work and I'm very busy so I don't know if/when I will get to it.
Best,
Joe