I've been trying to write a simple plugin for myself but can't seem to figure it out. To be honest I don't find the WordPress documentation helpful enough.
Basically I just want to add month names to the rewrite rules for permalinks and archives.
eg: /%year%/%monthname%/%day%/%postname%/ = /2007/february/03/sample-post/
and then have /2007/february/ for archives too.