[bgalbrecht]

I believe you can search by tags with the nookLibrary app included in the softroot package. However, it's rather painful because you're scrolling through a list that gets rather long as you add more books to your nook. Another issue with the nookLibrary app, it sorts author by first name instead of using the sort order information included in the epub files.

I think the nook needs a library app that is tree based. For example, sort by author figures out how to split up A-Z, then under author, be able to select by tag or series, as well as by title. Likewise, if selecting by tag, figure out how to split up the tags, and then search by author or title. If you only have a few books on your reader, it's no big deal, but if you've got hundreds (or thousands) of books on your reader, the built-in library app and the nookLibrary app just don't cut it.