Leland, iPac's ability to spit out XML is an undocumented feature, or at least a poorly-kept secret. I agree that it's definitely a step in the right direction, though. 5 years from now (or, let's hope, sooner), not having a clean, well-documented web services API for your OPAC will just be inconceivable.

I've written server-side java code for RSS feeds that any library running iPac could install on their server to offer this functionality and more, but not many people use it (including the library I work for), because they just don't understand the importance of it... or they don't want to have to bother explaining to a mostly technophobic public how to use the feature.

I find Library Elf's privacy policy pretty troubling, too. Saying they will turn over records if asked isn't too surprising, but why on earth would they be saving any subpoena-worthy information? In the post-PATRIOT world, the philosophy should always be that they can't subpoena what you don't have.