Rails Edge changeset 6158 added automatic eTag support. I needed it in a Rails 1.2.3 project, so I made a little patch to shoehorn 6158 into 1.2.3.
“Here’s the patch, ":http://gweezlebur.com/assets/2007/7/9/patch_etag_support.rb just drop it into lib and require it.
Updated: includes 7580 too.
Updated again: I’m having some issues with this, so looks like I blogged it pre-maturely.