How do virus move?

Another awesome science question answered by scienceblog’s ERV.

An ERV-ling asks how do viruses get about without some sort of motility structure, like flagella or cilia?

This is an excellent question, especially as someone who grew up in the world before 2008, viruses used to be considered barely above complex chemicals.

In true virus free-loader fashion, the methods of movement usually entail getting some other living thing to do all the hard work for them. Actin rocket packs sound cool though.