A couple examples of microtransaction-based services:
You upload a torrent file and Torrent traveler will retrieve the download for you. When the torrent download has completed, you then can pay $0.25 (per GB) to retrieve the download over the web: http://torrenttraveler.com/avpzaqvbpxgz4rukk3cgqoxvf
Here's an ebook, where chapters are sold individually, $0.25 USD each: http://project7alpha.com/2011/03/chapter-1/
Minno allows buyers to top up a wallet balance by charging to a credit card: https://www.minno.co/account#buy-credit
Minno is in closed beta right now but was featured on Tech Crunch:http://techcrunch.com/2011/03/28/minno-hopes-theres-a-place-in-this-world-for-a-small-simple-e-wallet
Bitcoin already has two bitcoin-powered download services http://Ubitio.us.com
and shopping cart interfaces http://en.bitcoin.it/wiki/Category:Shopping_Cart_Interfaces
to compete against minno, however the differences include:
- immediacy (There's no waiting for a block or two to confirm on minno before releasing the goods)
- slick API / integration
There's no reason Minno couldn't accept bitcoins as a "funding" method. There's really no reason why Torrent Traveler can't use using bitcoins directly.
PayPal competes with their PayPal/X microtransaction payment platform
It is great to see attention brought to microtransactions and the virtual goods industry.
It will be interesting to see where Bitcoins fits in these areas.