Craig Walls blogs about Pax Construct: http://www.jroller.com/habuma/entry/pax_construct_from_zero_to
Similarly, if you were to ask me what the best and quickest way to get started with OSGi development is, I'd tell you to have a look at Pax Construct. While there certainly are other ways to develop OSGi projects, I find Pax Construct to be the quickest approach with the lowest barrier to entry. Pax Construct is script-oriented toolkit for developing OSGi projects that, in many ways, follows the same programming model as Rails. With Pax Construct, you can go from zero to running OSGi-based application in a matter of minutes.