Michael reviewed Groovy Recipes: Greasing the Wheels of Java by Scott Davis and gave it 8 out of 10 horseshoes.

The book is driven by a series of insights rather than complete, formal coverage. I found this approach very useful to getting started and experimenting. The writing is clear, light-hearted, and relaxed, especially in the beginning. ... The examples illustrate very well the power of this tool, but I didn't see anything that amounts to, say, the Groovy way to mine a web page, create an IM interface, read mail, etc. If you are looking for code you can apply immediately to some series of problems, this isn't the one.

You can read the full review and discuss it here.