Everyone makes mistakes - you probably won't be able to make up too well with this guy in particular since negative reactions are very hard to shake. However, there are luckily tons more people and good work is good work, so keep it up!
I agree with Ryan here, I signed up as well, your site fills an important need that developers and designers have and I am looking forward to this.
The one point I wanted to criticize is that there was no validation on your form , i made a typo in developer and managed to get through.
Also I didn't receive any email confirmation.
I signed up on your site.