I wasn't very interested in Glacier at first, but the more I hear about it, the more I'm convinced it's a perfect companion to time machine backups. Why pay $13/mo for CrashPlan or some other similar service when I can pay a fraction of that for Glacier?
Of course, this makes sense for me because my backup is rather tiny (~300 GB). The "unlimited" plans at backup services are worth it in certain scenarios I guess.