Do you have some links to your side projects/no-burnout-work?

Sure (although a lot are websites that were shut down later on, to focus my resources):

[1] http://www.learnivore.com (ruby,rails,iphone screencasts aggregator)

[2] http://www.toutpourmonipad.com (ipad case finder for the french market)

[3] http://github.com/thbar/opaz-plugdk (an experiment to create VST plugins using JRuby and Java)

[4] http://github.com/thbar/music-labs (more music stuff with ruby)

[5] http://github.com/thbar/petite-lettre (a little ruby gem for inter-process communication based on yaml)

[6] http://github.com/thbar/magic (a DSL to make it easier to implement UI with IronRuby, WPF and Windows Forms)

I have one side-project ongoing (that I will mention here later on) and another one for after.

I have learned a lot on each of these projects - bits that have most of the time been reused shortly after on customer projects (sphinx, mongodb, jruby...).