I totally agree with TreeSpeed- Every day I see the same vehicles pass me at roughly the same time, same place on the road. If I can recognize them, they sure as heck are able to recognize me. I give them the respect they deserve, and they give me the respect and space that I deserve. If a new rider shows up and starts messing things up I would find it very annoying (as would the drivers of the vehicles).

My only suggestion to you TreeSpeed. If and when you decide to advise these presumably new cyclists of the rules and etiquette of cycle commuting, ask them if you can give them some advice-don't just start telling them what they should or shouldn't be doing or they will take offense and not listen. The things you point out to them could save their lives (or yours)