Surely thats distro dependant ??? Because, for example, those of us using mandriva would probably all be aware of easyurpmi - we can get the rpms specifically tailored for whatever version you're using.
Though maybe those who use, say gentoo, might not really care - emerge will look through the list of their mirrors until it finds one that will let you in for whatever you're trying to emerge - unless you have a specific one set.
I mean, isn't that the whole point of forums, too ask Q's like that ??
"What the large print giveth, the small print taketh away". Tom Waits