Why the P2P Foundation pays salaries in Bitcoin
blog.p2pfoundation.net
blog.p2pfoundation.net
A bitcoin address is basically the hash of a public key. It's trivial to prove that you are the owner of the address.
Once you use names instead of addresses you need a mapping of names to addresses. Who owns a name? Who determines to which address a name maps?
The namecoin project is currently trying to solve this problem (and doing exactly what you suggested), but there are still lots of potential issues.
Your 19HcFgnnJseANJAHUjFifVwz68AGYrHc7v address for example, firstbits down to 19HcFgn: http://firstbits.com/
This satisfies my curiosity: I have seen uses of bitcoins as a financial instrument (although this is the first time I've heard of it being used for salary payments), but I have yet to see it used as a currency (except for speculators).