The table below shows the 10 most successful active players since the year 2000 up until the end of Queen's 2011, calculated by summing ranking points earned each year*. The table also shows the number of those points that were earned on grass, as well as ranking by grass points and the percentage of total points coming from grass events. Note the 2000-2008 ranking points system was used for all values for consistency (for example 1000 points for winning Wimbledon, 700 for runner up).
Top 100 here.
*Complete methodology in this article.