Asset Packager for Heroku
We absolutely love Heroku. The one hurdle everyone must face is their read-only file system. Most of the time, this means uploading files to Amazon S3, which is preferred, but the other issue we've run into is packaging up a multitude of Javascript Libraries, and CSS files. Packaging and combining those asset files into is a compressed version imperative to increasing performance and server response time.
Enter amasses' heroku asset packager. HAP works with Scott Becker's asset packager to provide merged and compressed asset files in production on Heroku. Through a little duck-punching and Rack middleware, you can now serve merged files from Heroku's public tmp directory, reducing 10, 20, or 100 server requests for css and javascript files down to one. If you're a Rails dev pushing to Heroku, check it out. The ability to configure all of your assets via a YAML file is worth it alone.
Crap. Upgrade time!