Display monthly archives by year with links to each month in the following compact format:
2012
1 2 3 4 5 6 7 8 9
2011
1 2 3 4 5 6 7 8 9 10 11 12
2010
6 7 8 9 10 11 12
Serves as a drop in replacement for wp_get_archives( array( 'type' => 'monthly' ) );.
If you’re interested in contributing to the code behind this plugin, it’s also hosted on GitHub: https://github.com/justincwatt/wp-monthchunks