There are some good comments in that stack exchange question. They divide the units by people and get 300000 satoshis/person. I was going to mention though in order for those small units to be useable the currency would have to be very valuable. Right now the trading fees are somewhere in the order of 0.0001-0.00001 so if you have any less than that you cant be sure that you will be able to transfer them.
To me this is one of the most interesting things about Bitcoin. It is an asset based currency. In a debt based fractional reserve dollar economy you or someone else owes that currency back with interest. The economy is like a game of musical chairs. If a society was based on something like Bitcoin everyone could have assets, there wouldn't be as a strong need to borrow as there is today.
If Bitcoin was a predominant part of an economy borrowing a loan in it could be very bad. In a predominantly Bitcoin based economy everyone could have abundant wealth and there would be no need to be a debt slave.
Inflation killed the Zimbabwe currency because delusion caused it to become worthless not because of availability or velocity issues that people are worried about in Bitcoin. These are two separate issues that people always seem to talk past each other on the subject of Bitcoin deflation. Splitting a Bitcoin into smaller units allows for unrestricted availability and velocity. Anyone can always buy and sell at market rates to complete a transaction. Inflation or Deflation of the currency has no effect on its availability. So why is it bad if it is deflationary?
In Bitcoin the supply and availability of currency are decoupled. By funging or splitting a unit of Bitcoin currency into pieces you increase the availability for use while preserving the value of everyones holdings. Based on the supply and demand the price will fluctuate independently of supply levels.
My understanding is that regardless of how inflationary or deflationary Bitcoin is, there will be no effect on the availability for anyone to buy and sell.
The fundamental value of Bitcoin comes from the network. While a single Bitcoin wallet doesn't have any individual intrinsic value the same can be said for any mid-sized company and it's assets. If you teleported a company to mars blocking it from customers and suppliers it would be equally affected. I don't agree that Bitcoin has no fundamentals behind it.
I feel the opposite. A friend and I put a submission together for the MintChip Challenge, mintchipy.com. My bigest concern then and now is that no one can use mint chip because it's not public.
Coincidently I am working on another project now that uses BitCoin... Fad or not Bitcoin serves a very strong need for me an many others.
Just a thought. You could charge for submissions to be displayed publicly as a five star rating based on some metric to obscure the exact numbers. This would protect the submitters to a degree from poachers as people can only see with low resolution if the project is desirable. It would also be a source or revenue.
I think this project is a good idea and look forward to seeing it live.