In light of Joom!Fish's recent accomplishment of 1,000,000 downloads on JoomlaCode.org, it seems fitting to blog about it.
To date there are 5 projects that have this distinction. As of this writing, they are:
Joomla! (14,964,084 downloads)
JEvents (1,846,222 downloads)
Joomla! Spanish (1,624,758 downloads)
DOCman (1,576,471 downloads)
Joom!Fish multilingual extension (1,010,428 downloads)
From the looks of it, JoomlaPack and Fireboard/Kunena Forum are not too far behind.
It should be no surprise that Joomla itself is on the list, but are there any extensions on this list that surprised you?