RationalWiki:User edit counts
This page allows for easy queries about user's editing patterns. You can choose to search for a specific username, or find the top edit count users up to the number of users you pick. You can also search under specific years, or specific month and year.
Note the php script that handles the queries was specifically set up for get requests so that those interested in working with this data from a bot can request it in that manner. For example this link: http://rationalwiki.com/editcount.php?name=Tmtoulouse&month=09&year=2008 could be put into a bot script and the data processed however you like.