There is some small ideas and big ideas to enforce BTC, though. We already gave Bitcointip in Haikko, and I am likely extending it to Punavuori (an area in the center part of Helsinki where about 5000-10000 people live). We will dole out free millibitcoins as bills, and inform all the restaurants there that if they serve their clients well, they will receive tips (because tips are already there in the hands of their clientele - we have give them out for free to all the inhabitants Then the restaurants can cash them in for euros, or redeem them for actual bitcoins. Or keep them in circulation as bitcoin-denominated change.
July 7th, the restaurants in central-southern Helsinki area would all be delivered a bulletin, concerning What is Bitcointip. They are small bills that soon will come to circulation and can at any time be exhanged for euros, or redeemed as physical bitcoins by bringing them to an exchange point (the area where this experiment is conducted is only about 100 acres (40 ha) and walkable. After a restaurateur sign, the tip is redeemable.
There are only about 5600 apartments below a certain line that classifies the area as South-Helsinki. These all can be delivered by mass mailing. Actually we believe that most of the salvos empty themselves in the trashcan, so the payload would be about 800 bitcoin-sheets which is 3,200 bitcointip notes. Free money can also be given on the streets to the ones who know. We need several Bitcoin-T-shirts for that (remember my earlier idea if the summit were oversold...)
There are about 300 restaurants in the area, I believe we have quite good ratios, if the number of actually usable tipnotes exceeds the restaurants by a factor of 10.
I thought the restaurant approach might work in Brussels as well (many restaurants in a tight area), but then, do you want to attract the attention of the EU?
They already know http://www.ecb.int/pub/pdf/other/virtualcurrencyschemes201210en.pdf)