Browsers (914 programs)
Pros: Fits discreetly at the top of your screen. Web 2.0 feel. Quick drag and click colour picker. Magnify what your arrow covers. Precise pixel ruler.
Cons: All the tools are fairly basic.
Pros: Makes it very easy to organize lots of extensions. Lets you create an XPI library without installing each plug-in.
Cons: Would've been nice to see a 'recommended extensions' feature.