A few EI members have reported success using a scotchbrite (sp?) pad to turn the chrome bezel into a 'brushed' finish.
Other have reported success using
NevrDull to restore the chrome finish.
You should be able to find these at your local grocery strore, WalMart, auto parts stores, etc.
As I've never used either on my iPhone, I can't personally endorse either....just relaying what I've heard has worked for other iPhone perfectionists.