Attempting to quantify your skill as a programmer by your reputation score alone is a horrible idea and anyone attempting to do so should feel bad.
Your participation on Stack Overflow, even with less than a thousand rep and just a few answers to your credit shows:
- What you're doing and interested in
- How well you can communicate, and more importantly, how well you can articulate a problem to your peers (because, who doesn't need to do that at least semi-frequently?)
- How well you interact with other developers
To a degree, even a small sampling does infer some level of skill, depending on the types of questions you were asking, where you present the ways in which you solve problems.
A decent interviewer is going to want to know a lot more than your score on some third party site. They'll also want to know what blogs you read, other notable programmers in your field or discipline that you follow, conferences you like to attend (or would, if given the means) and other things.
It's just a lot simpler to get that kind of overview conveniently on your Stack Overflow profile page than it was using Google to try and dig someone's participation out of Usenet and various other forums before we existed - naturally folks are going to take advantage of that.
Just interact well and put thought and effort into your posts and your profile page automatically becomes something of an accomplishment to be proud of, no matter how long you've been participating.
When it comes to good communicators that have knowledge that they wish to share here, or interesting questions for folks to answer, reputation is just a matter of time. Make sure your perspective employer knows that and that they see you belonging in that category and you'll be fine :)