Slices are self contained merb apps with models, controlers, views and assets that you can distribute as rubygems. You can mount a merb-slice at a specific point in your router definition and you can override any part of the slice up in your main app.

There’s a small screencast/tutorial over at merbunity

merb-slices is part of merb-more, so you can find it here: github

Some of the recent coverage:

Katz Got Your Tongue? The Greatest Thing Since Sliced Merb Brainspl.at merb-slices Unwinding the stack Merb slices: how they are different from Rails Engines