https://meta.wikimedia.org/wiki/User:Faebot/thanks
I have now set up a monthly report of the top 10 "thankers" / "thankees" with an index to the different project reports on the above link. These have been generated retrospectively for 2014 and I will shortly set this up on WMF labs to run at the beginning of each month to add last month's results.*
Rather than running this automatically for several hundred projects, I am happy to add projects on request (so long as the thanks extension is being regularly used by more than 10 people!). Just drop a note on my meta talk page to request the addition. I have haphazardly picked 6 of the busiest projects to get started on, mainly as a multi-language test, not because I favour one language Wikipedia over another. :-)
Time for someone to create a "thank you barnstar of super thanks" ?
This is one of many ad-hoc reports run as Faebot, but if it becomes especially useful or critical to outreach projects I'll consider moving a stable version to a special bot account or similar.
* - At the time of writing, the tables for 2014 are being generated. This may take the rest of the day to complete! If your project has recently been added, the reports might have to wait for the next monthly run depending on how much free wiki-time I have.
Fae