No I don't. Tarsnap isn't more expensive than JungleDisk overall -- yes, the bandwidth and storage costs more, but tarsnap doesn't have per-request costs, a fixed monthly service charge, or an up-front cost for the software. For some people, tarsnap will be more expensive, certainly; but for many others tarsnap will be cheaper.

you don't say why it's better

Not in this blog post, no -- this post was about how tarsnap uses Amazon Web Services. :-)

Details about why I think tarsnap is an amazingly superior backup system are at http://www.daemonology.net/blog/2008-11-10-tarsnap-public-be...