I wanted to write a post about the Social Science Research Network this morning, but it doesn't look like I'll get around to it. My basic suggestion, however, is to use this form of self-publishing for work that you would consider letting a publisher like VDM have instead. It's much more likely to have an impact there and doesn't look like an attempt to bulk up your list of publications. (You would list it as a working paper.) Also, as far as I know, publishing an early version of a paper with SSRN does not hinder your ability to publish in a more prestigious journal at a later date. But that's what I wanted to look into before writing this post. I'll return to this issue soon, I hope.