Yep, all these are just my voice and guitar, for now. When I record them I'll add bass tracks, other guitars, maybe drums, and vocal harmonies. Oh, and for some of them like the last one I posted, I play harmonica too. I have one of those braces that goes around my neck that lets me play guitar and harmonica at the same time.
And IMO, songs are the best when the lyrics and music are made at the same time. Sometimes I'll do one or the other first. If that's the case though, it's really hard to come up with a fitting counter-part.