Look at list of tools where you are invited to select the 10 best ones in each category.
“There are 10 categories you can vote in you are encouraged to vote in each. The top 100 Web 2.0 apps are selected by Webware readers and by the users of the products we cover. Vote for your favorite products to give them a chance to win Webware 100 awards. There are 10 categories you can vote in you are encouraged to vote in each. Note: There will be a special 11th category where Webware editors select the best products in unique categories, such as Rookie of the Year. These will be announced, with the rest of the winners, on April 19.”
There are 10 categories but lack of Web research (web clipping) category. The most interesting categories can be Search, Productivity and Browsing categoriesy.
In any case it is usefull to study the lists of each category.