Bitcoins are stored in the blockchain. As long as at least one person holds a copy of it, all Bitcoins will remain in place no matter how many people are in the network or if new software is still being developed.
As the main client is open-source, even if it was discontinued anyone can pick it up and continue development on their own. Even if that was unavailable, the Bitcoin protocol is not too complicated, so one could create a new client from scratch if needed be.
Lastly, the main client is pretty mature at this stage, so even if no further versions were developed, it could provide enough functionality for a long while.
All in all, as long as you store your own copy of the blockchain and a client, your money is completely safe, at least in regards to the amount of it you have. The value of the stored Bitcoins, however, can always drop or rise regardless of the state of the project, which is another factor to consider.
4Note that only Bitcoins you hold are at risk. Depending on the way you set up the system, Bitcoins may not need to be held by anyone for any significant period of time. And, of course, if you hold them, they may also increase in value. – David Schwartz – 2012-03-07T09:15:12.030
OT: Good luck with your project! – o0'. – 2012-03-07T09:48:34.060
1@DavidSchwartz if you hold them they may also decrease in value – Zachary K – 2012-03-07T11:15:51.060
Incidentally, there is a payment processor in the region: https://en.bitcoin.it/wiki/Karsha_Shopping_Cart_Interface
– Stephen Gornick – 2012-03-07T13:55:10.9305I think you have a misunderstanding besides. Bitcoins are not a way of storing money that is in a conventional currency like dollars or euros or pounds, it is a separate currency. So, if you buy bitcoins, your conventional money isn't "stored" anywhere, it goes to the person you bought it from and you are counting on being able to sell or spend the bitcoins later. – Random832 – 2012-03-07T15:33:21.237