VortexVFX
I'm not sure it really works that way. Houdini by its very nature is a package that you're likely exposed to through professional channels in the first place (or crazies like me constantly eulogising about it until it bores everyone to tears), rather than glitzy marketing campaigns.
I know what you mean, I got evangelized by watching Peter Quint's videos and the friendly and enthusiastic community were a real motivator to learn Houdini. I'm sure the support is also great, always read good things about it, which is a big plus indicator for prospecting new customers
Edit : Yay, it's out along with updated tutorials, awesome!