There is a "greatest hits" list for each Stack Exchange site: just add /questions/greatest-hits to the end of the domain. Examples:

http://serverfault.com/questions/greatest-hits

http://stackoverflow.com/questions/greatest-hits

http://mathematica.stackexchange.com/questions/greatest-hits

http://programmers.stackexchange.com/questions/greatest-hits

There's of course an "is:answer" search sorted by votes for each site as well:

http://serverfault.com/search?tab=votes&q=is%3aanswer

http://stackoverflow.com/search?tab=votes&q=is%3aanswer

http://mathematica.stackexchange.com/search?tab=votes&q=...

http://programmers.stackexchange.com/search?tab=votes&q=...