I just googled "pipe and a keyboard" and your site comes up, and for "install adobe air linux 64 bit" your site is coming up 5th.
So it's not blacklisted, it's coming back in the SERPs.
Maybe try checking other search terms that usually give you a lot of traffic and make sure you're still ranking for them?
(And make sure you're not seeing personalised results - make sure you're not logged into google, stick &pws=0 on the end, use a different browser, etc.)
If you've stats available for the same period last year, check against those, just in case it's a holiday in one of your main visitor countries or something like that.
Is it just search that's not recording any visits? Are analytics showing anything at all?
Make sure your GA tracking is working correctly, check that you have the correct tracking ID.
Maybe visit the site yourself from a search and check that that's being recorded correctly.
I notice your first blog post is about moving a blog to a new server - did you recently move this blog? Maybe on September 26th?
Could be that the DNS changes hadn't propagated, and people were being directed to the old server and getting a 404. Should be OK by now though.