If they can keep up the momentum ;-), eFoundations, a new blog by Andy Powell and Pete Johnston of Eduserv, will be worth tracking. Here is Andy beginning a discussion of repository interfaces:
Anyway, I digress… to get back to the main point, my answer at the time can be summed up pretty simply. In short, an item bank is a repository and therefore it should support the same interfaces and standards that any other repository is expected to support – the OAI-PMH for harvesting item metadata, SRU for searching metadata and/or full-text, RSS for disseminating news feeds and other lists of items, HTTP for getting the items themselves, OpenURLs for any links to bibliographic resources and cool URIs as identifiers for everything that needs to be identified. [eFoundations: Item banks as repositories]