[mgkimsal]

"Wide Adoption" - always hard to pin down, but as my ears are tuned to Groovy, I'm seeing it in more places. In some ways it's harder to pick out, because a company that's 'using python' will more likely have a larger stack of python (or jython) code. Groovy can (and does) fly under the radar more, precisely because it's so similar to Java syntactically, and fits in the toolchain (add a jar to the classpath and you're off).

You probably won't find many projects built "just" in Groovy - because of its JVM nature, you're more likely to find Java projects which are enhanced with Groovy (Groovy plugin for Hudson, for example, and the Play framework supporting Groovy in templates). Gradle as a build tool is starting to get some traction.

Groovy will probably be more behind the scenes than you'd like for a 'hey boss everyone is using this' sort of pitch, but it's not going away any time soon, and adoption is growing.

Biases on the table - I've done a number of mid-scale projects in Grails over the past several years, and I also run groovymag.com.