Looks like somebody did something to replace that travesty of a library manager for the Sony eBook Readerlibprs500 – Trac has builds for Windows, Linux, and Mac. It can modify metadata! For things that aren't .pdfs! Can't seem to do it once the files are deployed to the reader, but it can do it inside the library and *then* move it to the reader. This is great!

I'm very excited to go through my library and tag everything correctly. Thanks, guy!