Great features, great pricing, OS X Lion compatible. One of the amazing features of this product is the ability to (for free) backup to other devices on your LAN or to friends computers across the 'net!
CrashPlan is a great service. I've been backing up multiple Macs and PCs using their remote backup service for a couple of years now after switching from Mozy, and it's worked flawlessly and unobtrusively. It's nice to have insurance against disaster, and it's extra nice to have that insurance without me having to remember to do anything.