Since most of the projects here at MetaFruit are browser plugins... a newsletter helps because:
1.) Chrome lacks a versioning system for extensions, meaning users don't know when or why their software updates! (Google, please fix this!)
2.) Some Firefox users turn extension updating off by default (smart!), but this means they don't get software updates without knowing to do something.
3.) Every so often, another project ripens up and falls from the tree. You'll be the first to know! ^.^