A maintenance release (0.5.1) of GMongo was launched. It just fixed a bug with com.mongodb.DB#createCollection.
But the good news is the GMongo availability in the Maven Central (http://repo2.maven.org/maven2/).
Maven:
<dependency>
<groupId>com.gmongo</groupId>
<artifactId>gmongo</artifactId>
<version>0.5.1</version>
</dependency>
Ivy:
<dependency org="com.gmongo" name="gmongo" rev="0.5.1"/>
Groovy Grape:
@Grab(group='com.gmongo', module='gmongo', version='0.5.1')
This should compile and run seamlessly in an environment with Groovy 1.7.2 (or later):
@Grab("com.gmongo:gmongo:0.5.1")
import com.gmongo.GMongo
def mongo = new GMongo("127.0.0.1", 27017)
def db = mongo.getDB('myDb')
db.greetings.insert(hello: 'world')
Updated: Version 0.6 is now available as well.