Marten Mickos is working on a joke. He has the opening line — “An ops guy, a VMware guy, and a cloud guy walk into a bar…” — but he hasn’t figured out what the punchline is, yet. Mickos is the former CEO of MySQL AB. Today he’s the CEO of Eucalyptus Systems, developers of private infrastructure as a service solutions, and he thinks about “The Cloud” a lot. Eucalyptus Systems is releasing version 3.1 of their infrastructure as a service (IaaS) product today, with a number of new features, improved installation options, and a renewed commitment to open source.