Users who made it to the 1st/2nd/3rd place in Top Solvers table in a certain month, get a Certificate of Achievement.
View an Example

There are four categories:
Top Solvers of Griddlers, by Puzzles
Top Solvers of Griddlers, by Points
Top Solvers of Triddlers, by Puzzles
Top Solvers of Triddlers, by Points

Certificates were issued for year 2009, from January till November. At the beginning of every month new certificates will be issued for the previous month.

How to get/view the certificates?
Open the Top Griddlers Solvers or Top Triddlers Solvers page.
Select the category (By Puzzles or By Points) and the Month (11, 10, 9...)
Click on the 1st or 2nd or 3rd username to open their profile page.
Under the "Certificates" section appears the reference "Top Solver of Griddlers (or Triddlers) by Puzzles (or Points) in month/year".
Click on the PDF icon(s) to open the certificate(s).

Enjoy! :-)