If you search for a gem on the rubygems.org e.g. http://rubygems.org/search?query=wirble you'll see a message like 'Displaying all 4 Rubygem' instead of 'Displaying all 4 Rubygems' .
This appears to be a outstanding issue on will_paginate. See: mislav/will_paginate#208.
I'm going to close this for the time being until the upstream issue is resolved.