I wouldn't use it myself atm, but seeing the success and hype that secondlife has got in its time, I wouldn't call that a bad idea either.
If we can get the hoards of SL users to adopt Bitcoin as a cheaper and more convenient alternate to the Linden dollar, that would bring a sizeable amount of capital in the Bitcoin economy and will make headlines in the news.
This project is a good starting point as if it successes, shops will need to hire the services of virtual goods designer who tend to be second life buffs..
I was just thinking more about what BKKcoins was saying about needing to put all the coins into a central wallet before going into the mall. I could have either Kitsune or Kurin write a script where when the user clicks on the item or goes to buy the item, their redirected to that vendors page to buy it instead, seeing how trust has become a huge problem here -.-.
There is no point shopping in a virtual mall if one has to revert to the vendor's webpage to complete the transaction.
What you want is immersion and seemless integration.
There is a way you can get that : hack the viewer to send JSON payment commands to the Bitcoin client and find a way to integrate that feature in the GUI. You can have the keys exchanged using avatar dialogs.
If you can't do that yourself, create a bounty to get it done.
Also, thinking about it more, I think the shops might be too small as their 10x20m but I dunno what dimensions to make them as I don't know the dimensions of a shop in real life and i'm sure they'd arrest me on sight if I tried to measure. Any idea what to make them?
Count in steps, nobody is going to arrest you for strolling a shop.
Or more simple : check the floor plans and dimensions in real estate announces.