Since this is free software, we already have a complete software center
available, straight from launchpad.net/software-center.
(Actually, it doesn't yet work on Fedora, partly because of unmet
dependencies, but those are just technical bugs, and I don't think it
would be difficult to have something running soon)
What is missing, though, is the data, representing the applications
available in fedora repositories.

I totally agree with you, a software center would be a really nice idea, also for more experienced user because they can browse easily through the available software and may find something interesting.

Regards