Netbooks?

The wife wants to replace our older laptop (we have a Macbook that she uses mostly) with a netbook. Mainly, it would be used for surfing the net with not too terribly much else, though there may be some document work and such.

As I'm too lazy to see if this has been discussed before (I know that Mac vs PC has been in the laptop thread), anyone have any suggestions? Pros vs cons of a netbook vs. another laptop?

Thanks in advance.