Ease generating image previews (thumbnails) of various files

Use rack middleware to handle sprockets preprocessing. Processing happens on requests to sprockets resources. This allows you to develop, check in, and deploy unprocessed sprockets resources and leave the processing to the middleware. Allows for optimizing by environment: never-cache, always-reprocess in development; cache, process-once in production (for example).

Thoughts cosists of three parts - a library for generating static sites, a CLI for automating site generation tasks, and a web interface for creating content and managing your site.