I think this is pretty cool.
If people can personalize their BTC wallet address, i think the avg Joe would really dig that.
I mean everyone wants to personalize everything nowadays...
This would be really good for corporate purposes as well, and it would also cut down on someone sending to the wrong address in the future.
Trying to buy a sack of burgers, it would be much easier to send to 1JUICEYshakesNbuns247 rather than 1CHf2243s9TxDwEzbRwWAS2bLcooUCfrTZ
Then again, if BTC one day has real mass acceptance, the above vanity address might be already taken by a savvy stripper