It would be fun, but on the other hand, to my understanding a library employee's idea of "good money" looks an awful lot like a technologist's idea of "OMG I am going to lose my house."
If you're interested in how libraries are using technology, check out code4lib[0], a community of technologists who work in libraries. Hang out with us on IRC, subscribe to our mailing list (which includes numerous job postings, many of which pay reasonably well[1]), read our peer-reviewed journal, and consider attending our conference. I think you'll be pleasantly surprised.
I also recommend checking out LibTechWomen[2] and Information Technology and Libraries[3].
It actually can pay pretty well. It's not Silicon Valley money, but it's around Milwaukee bigco CRUD code monkey money. I know a few liberal arts graduates that were working dead-end jobs who went back for the MLIS mainly for the money.
Being a technologist for libraries sounds awful, though. They deal all day w/locked-down journals, proprietary databases, the MARC formats, and various systems from the 60s - and I'd need more than I make now to work with that crap.
Do not confuse nostalgia for reveration. The old programming systems are indeed quaint, and should be preserved, but not used. There's a reason we've moved on.
