Agreed. Geeks and nerds are both people with non-mainstream interests/hobbies. The difference is that nerds tend to make a good living pursuing their interests. It's an economic distinction.

Shallow article...but I would categorize geeks as being technology-centric, while nerds are "anything-else-centric". So, software developers/hackers/etc are geeks, while librarians w/ advanced degrees are nerds. Not sure where to draw the line with rocket scientists. However, this topic has been debated ad nauseum, with no resolution.