Guys, let me add that the visa officer asked me to wait for a week or max 10 days and even then if my bar code number does not appear on the website, I shall write e-mail. I did the same and immediately was asked to bring the passport in for stamping visa. Hence, on the whole, it took me 10 days from interview to visa stamping.
In my opinion, the people who are rejected US visa are told there and then towards the end of interview. If you are not told so, 99% chances are that your visa is approved.
Don't lose hope Desperado. U'll get US Visa.