I finally got off my fat ass and setup an offsite backup of all my photos and other documents on Amazon S3. S3 is very impressive; very quick to setup and get going. I guess I'll find out in a month or so how cheap it really is :) but on paper it does look pretty cheap.
This article was a great overview of how to create backups using s3sync which is a ruby version of rsync which uses Amazon S3 under the covers. Neat! Add a little Anacron and hey presto, incremental online backups on all the macs in my house; and my wife won't kill me for loosing all the pictures of our daughter :).
(Yes I know flickr might be a better online backup for pictures; I just figured I wanted a general purpose backup mechanism that backed up anything I fancy, not just pictures).