Ask HN: What are soft skills?
Being able to communicate well, being an effective time manager, being a solid leader, etc. Some of the intangibles. Also, the google link that kelukelugames posted probably has some good info.
They're the skills that allow you to effectively and pleasantly interact with other humans (as opposed to the technical skills that you use for interacting with machines).
In the context of a programming job, everything else.