In our use of purgatory, we queue messages if there are database connection problems, but this approach can extended to nearly every type of service. The module itself is agnostic to the types of connection errors which can occur.
MongoHQ wrote a helpful blog on the encryption features in MongoDB. Its a big deal for the larger, more cautious companies as well as smaller ones, so it behooves a MongoDB host in company like MongoHQ to help share information about MongoDB's security.
Notes to a Software Team Leader is a must read for a programmer turned (partially or fully) to manager of at least one other person. It does not assume an ideal world and guides you through the phases of finding time to learn and challenge the other people in your team so that they can become independent.
This may not be news to some developers, but it's good for people to know that ESBs are not just for service-oriented architecture. This article explains what proper ESB solutions and SOA architectures are supposed to imply.