@J9090 i would use Photoshop. (I use CS6 myself). If the version you use doesn't already have the tools built in, then there are add-on tools you can download and install to generate normal maps. I believe the same goes for specular maps.
@player2 It most certainly would be interesting. A concept like the "Follow new updates" button on a person's page. For example, if I follow Lundy, I would click the button and it would give me a notification whenever Lundy posted a new file. If I follow the Vehicles section, I would do something, and it would give me a new notification whenever something is posted.