I've often wondered about such "payment in the browser" options but... isn't this what we *do not* want?
Right now bitcoin payments happen quite easily. Just paste in the address, enter the amount, and click send. Done.
Wouldn't the "paypal" way require an intermediary website? Yet another site where you have to store your coins, will probably have to pay a fee, ...
What I mean is some kind of button a person can put on their site that says "buy now X no. of BTC".
Paypal allows you to easily do this.
If someone makes a button that just invokes the client program to send money and prefills it, and somehow redirects to a page after payment is confirmed, it will be an instant hit on the internet among digital marketers.
Right now, all there is, is bitcoinservice.co.uk, a thoroughly basic site.
The reason I say it would be attractive to digital marketers especially is because they do a lot of trade between themselves, buying and selling services.
As an example, here is a service that is used by one forum. It enhances Paypal payment functionality. It basically allows you to dynamically price and do other neat stuff. They have overseen 18m dollars of revenue. And this is a tiny proportion of the entire digital market:http://www.warriorplus.com/wsopro/
What's cool about this service is that these are for products that are sold within the marketing community i.e. not even to the general public. Much of this money just revolves around this one community and only a portion of it is ever cashed out in my opinion.