"Extras" is the repository applications should be in. Developers should upload them for testing to "extras-devel" and then promote them to "extras" once they're considered stable (or at least good enough). Some applications, though, seem to be stuck in "extras-devel" forever. So the only way for end users to install them would be to add "extras-devel" to your list of repositories, which is maybe not what "extras-devel" was meant for, but still....

So what do you do? Do you use "extras-devel"? Or do you wait for applications to appear in "extras" in a distant future?