The field is interesting, Library Science that is. If you have a master's in an academic subject already, that really opens up opportunities in higher education. The basic deal is that despite there being a lot of drudge work day to day, you can step back at some point and go "Holy cow! I did something important!"

I'd recommend doing courses on the meat and potatoes side of the field: Collection Development, Cataloging, Technical Services and so on. I'm not so wild about doing Digital Libraries specifically because, at this point in the game, every aspect of library work has a digital element and the courses are increasingly covering that. In order to get qualify for the good Digital Library jobs, you need a pretty serious programming background. And that increasingly means significant knowledge of Java as a technology(not just a programming language). In fact, I'm not even sure I can get some of these jobs and I've been programming professionally since 91.

However, jobs for library degreed people pop up in the darnedest places. The job I'm currently in is basically a librarian position, but it was advertised as a programming position. I've done jack all programming so far while I've done immense amounts of knowledge organization, cataloging and technical writing.