I was hanging out with a really good friend last night who was telling me about her relationship with a coworker that she had. I figured there should be a term for that type of relationship, best friends that you work with, I initially thought "career-mance" but then decided on the much more obvious term, "Promance".

Searching the internet today, I found that I was not the first to come up with this term.  Oh well, great minds think alike I suppose :)