Store files in a web-accessible location. Includes S3, Azure, and local filesystem-based backends. Can also scale and autorotate image files. Additional storage and image-processing backends are easy to create.
Painlessly deploy node.js applications to your staging and production servers. Use a standard VPS or dedicated server to host both Node and traditional Apache-based websites. Pairs nicely with nginx and mechanic.
A modern oembed client. Allows you to register filters to improve or supply oembed support for sites that don't normally have it. You can also supply a whitelist of services you trust to prevent XSS attacks.
Multiple file uploads, based on the BlueImp jQuery uploader. Makes it very easy to attach one or more files to whatever you're editing. It's also easy to present that list again on a later edit so that existing files can be managed side by side with existing attachments.