We're renaming the web_components package to web_ui. Aside from saving everyone's wrists a bunch of keystrokes :), this new name was chosen to reflect the growing mission for the project. When we first started, we envisioned the project as a polyfill for the new HTML5 web components standard. But since then the effort has expanded to encompass a bunch of model-driven views (MDV) and template features, data watching, CSS polyfill work (just starting), and more. Web components is one of the shiniest new features, but there are other shiny features already there and more coming.
We also have a new mailing list for the project! Please do sign up if you're interested in discussing how to build web apps on top of the exciting new standards.
I’ve uploaded a final version of web_components, with @deprecated, that depends on and exports the new web_ui package. I hope the upgrade process is relatively painless -- but don't hesitate to reach out to us if you hit any problems.