Is there something like MySQL enterprise monitor for Postgres?

or/and is there something to spot what are the most critical sql
queries/function behind an application?

Reading http://lstigile.wordpress.com/2007/12/27/cms_mysql/ it does
look more a tool to tune MySQL configuration... what about tools to
spot weak places in Postgres applications?

thx

--
Ivan Sergio Borgonovo
http://www.webthatworks.it