Namecoin is actually a worthless project at the moment. Nobody in their right mind is going to accept Namecoin as a DNS system, except for one audience that Namecoin isn't yet addressing...
TOR HIDDEN SERVICES.
Why? The world doesn't demand a new cryptographic DNS system, it's happy with the one it's already got. The fact that Wikileaks and Pokerstars lost their names is of little concern to the world, especially since they can both easily register under another TLD with no significant impact. If the world were looking for an alternate DNS, least of all, it sure isn't going to take one where virtually every prominent trademark has been cryptographically squatted on by anonymous wanna-be profiteers.
But Tor hidden services have no working DNS, and a side consequence is that it's rife with phishing sites and people can't tell if they're at the right site because the names are non-memorable. If the address for Silk Road were "silkroad.onion", people could distinguish the real deal from phishing attempts without having to memorize "ianx6zasdflkajsdflkj" or whatever.
If Namecoin development went toward making it the de facto name registry for hidden services, it suddenly would be valuable and useful. Otherwise, namecoins are as worthless as ixcoins.
Yes providing tor hidden service names is a great use for namecoin:
http://dot-bit.org/Domain_names#Value_fieldThe next biggest REAL thing that namecoin could potentially accomplish would be to serve as a registry of the correct SSL certificates for websites. THAT is something the world actually is demanding, i.e. the current system is actually broken.
TLS support is potentially the most important application of namecoin:
http://dot-bit.org/Domain_names#TLS_support