MongoDB released version 2.2, which includes several notable features such as password authentication with Mongoose, Motor Progress Report GridFS, and improvements to the Java and Perl drivers. The MongoDB blog also highlighted various blog posts of the month, including tutorials on aggregation and custom ecommerce solutions. Additionally, MongoDB 2.2 introduced new features like controlling collection distribution with tag-aware sharding and good night westley: time to live collections, which allow for more efficient data management and better performance. These updates demonstrate MongoDB's ongoing commitment to improving its scalability, security, and developer tools.