related to NickLarsen post:
I use Careers 2.0 only as public profile of my Developer skills (little bid narcissistic, but that's how it is). Even if it provides communication feature (messages) it's up to me as a user decide if I will use that feature. I think is really bad idea to remind user over and over "you still didn't reply" => therefore force them to reply
If I wanted to answer that message I would do that from the Careers 2.0 interface in the first place. But that's not the issue. The issue is that I cannon un-susscribe from notification feed.
so just a suggestion:
From UX perspective: respecting users choice to unsuscribe from a certain email feed is not a new feature, it's a key feature in any social web-application (yes even if we talking about email feed notifying user that he has a message)
More important, from marketing perspective: If user has no capability to unsuscribe or turn off notifications he will usually send these kind of emails to spam. This devalueate whole domain in eyes of span filters.
Facebook, LindkedIn, LoveThis and basically all social networking applications accept this basic UX principle ...I really think that people behind Careers2.0 should rethink this.
And one more comment for future to consider: So far the idea behind Careers2.0 was really nice (Despite ignoring user right to unsusscribe from emails :) ), please don't try to turn it into LinkedIn alike application
P.S. sorry comment was to small to fit this in