Hi David:

My Amazon to MARC service may be the answer for you.  Go to this page: 
http://amazon.libcat.org/cgi-bin/az2marc.pl and enter the ISBN into the 
box labeled ASIN.  Not only will you get basic bibliographic data, but 
you can export it as a MARC record.

Enjoy,
--CL

On 1/21/13 7:04 PM, David Fiander wrote:
> I'm working on a project that involves collecting information about the
> books that people own, and the easiest way to do most of that data
> collection is to collect just the ISBNs for those books that have them, and
> photograph the title pages of the books that don't. This gets me out of
> people way quickly and lets me do my data processing later.
>
> I've asked OCLC about the requirements for getting an affiliate ID for
> using their APIs for the project, but while I'm waiting for that, I'm
> looking at the Open Library APIs.
>
> The documentation for the APIs is weak, and it looks like it hasn't been
> updated for a while. Has anybody used them much, or know what the state of
> ongoing development of them is?
>
> All I'm really looking for at this point is a way to convert an ISBN into
> basic bibliographic data, and to find any related ISBNs, a la OCLC's xISBN
> service.
>
> - David