+1!  (But then again I raised the suggestion in the other thread, so maybe I'm out of points...)

Seriously, I think it's a nice idea.  You've put a lot of work into the tool and it'd be nice to be able to build on that.  Plus you're talking about something that could become a nice library (with a gem, which you're already interested in) on RubyForge.

Any tips on using s3sync from another ruby app?  I'm thinking about making a TextMate/e Text Editor AmazonS3 bundle (written in Ruby), and rather than start from scratch, I thought I could perhaps use s3sync.  One command I was thinking of writing was a command to back up the Bundles/local directory (which often contains a lot of customized stuff you might not want to loose).  Or, more generally, the ability to back up and restore project directories from S3.  I generally use Subversion for this stuff, but I'm not really happy unless I have my data in 3 different backup locations.

Thanks for any ideas.

Nice job, Greg!  It was getting to be a pain following that 160-post long thread on AWS!