Small samples of Bitcoin as a currency:

• Bitcoin Now Accepted at World’s Largest Game & Gift Card Retailer.
• You can now buy WordPress.com (world’s largest blogging platform) upgrades with bitcoins
• Meet the Subway franchise owner who accepts bitcoins
• Shut up and take my bitcoins! A map of Bitcoin-friendly businesses

Obviously the recent volatility is an issue, because your Subway sandwich may cost 0.005 Bitcoins when you order it and then cost 0.009 Bitcoins when you go to pay 2 minutes later.

What happens when Starbucks starts accepting Bitcoins?