I just checked, and apparently explain.depesz.com is online for over a year now. First plans was added on 2008-12-04 13:20:43+01. Since then there have been 3602 plans added, 770 of them were set to be private (not displayed on previous explains ...

On 4th of January, Tom Lane committed patch by Takahiro Itagaki, which adds new contrib module - pg_stat_statements: Log Message: ----------- Add contrib/pg_stat_statements for server-wide tracking of statement execution statistics.   Takahiro Itagaki