I agree we need to focus on things other than just the currency. It is a medium and if people come here for other functions, they'll gain some comfort with the currency. There are a lot of countries in the world where people cannot buy something as stable as a USD so they watch as their own currencies inflate and reduce the value of their own hard work and savings. Add in remittances and the market is there for a good currency that's stable, instant, and easy to use.
As for micropayments, there is a great deal of potential, though it may not be a lucrative business as much as a way to help the world and bring in a broad base of users. If someone can develop a service akin to a tipbot, maybe a browser plug in that can send micro-tips whenever the user reads an article he or she likes, etc., then that could give news sites a new source of revenue. We could see entire business models spring up from micropayments, which I think could be a natural tie-in with any reputation-based system online as well. And charities certainly would benefit from micropayments.