The lowest megapixel of webcams of a similar age and spec to this webcam is 0.3MP and the highest is 20MP. With a megapixel of 5 megapixels, the Hercules HD Sunset has a fairly high megapixel compared to most of the other webcams that came out around the same time as this webcam.
We think you might also be interested in some of the other 5MP webcams currently available including the B990, or the B910 HD both from Logitech or the Genius WideCam 1050 which has better reviews.
If this webcam megapixel is not high enough for you then you might also want to look at the Live! Cam Chat HD (5.7MP), or the Live! Cam Connect HD (8MP) both from Creative Labs or the Trust Trino (8MP) which also has a higher rating.