There are plans for this. Allowing 3rd party applications to make
loans on behalf of a user (after the user approves the application),
is certainly something we want to do. I updated the roadmap to
reflect this:
http://developers.wiki.kiva.org/Roadmap
We'll update more details here as we work those out. It is possible
to make an iPhone application that lets users shop for new loans, but
it's true you can't help them through the checkout process. One
change we might make soon is the ability to deposit a set of loans
into a basket for user. Then, they would have to check out on their
own at
kiva.org.
If you start an application on the current API, you'll be in a good
position to add "lending" capabilities when that's released.
Cheers,
skylar