Specifying foreign keys on associations in DataMapper 0.9 explicitly may be tricky from ActiveRecord user perspective. Here is how you do it, and some reasons behind this difference.

Merb core boot diagram is done and much more comprehensible, it can be found under /docs in merb-core repository.

Evan writes about successfuly serving of dynamic and static pages from a Rails app on Rubinius. Huzzah!

Merb router combines regular expressions, segments matching and nesting of routes to produce some very cool possibilities, say, for i18n plugin developer.

Adam French posted some thoughts that outline ideas behind DataMapper.

If you use Merb from Git repository, please update your rackup file (rack.rb) or Merb won't be serving your assets.

Looking for exception notifications for Merb application? Grab it at github.

Merb bootloaders explained at Merb wiki. Highly recommended to Merb plugin author wannabees.

Learn what configuration options in Merb cannot be specified in init file and why.

So you want to know what is the state of Merb on road to 1.0 scheduled May 29th...

MSpec and RubySpec become submodules of Rubinius now and it matters for your day to day development if you use RSpec.

Merb core now has a visualized graph of how the framework core boots. It probably will help a lot to wrap your head around Merb core internals.

Another blog post on Merb: this time on fine tuning inflector in Merb.

It's not obvious how to use ActiveRecord fixture helpers with Namespaced::Models, so here's the simplest possible way - just a one liner.

First Ruby design meeting notes posted.

There are rumours that Ruby implementation authors finally may start collaborating more and on regular basis. Maybe the MRI team will even consider switching to the Ruby specs suite Rubinius and JRuby use?

One of things Merb does better than Ruby on Rails is libraries bundling, especially if you use Git for your Merb application. A short blog post describes what is so cool about Git modules and teaches you how to freeze Merb and bundle other libraries into your Merb application.