Directory / plugin
Collapsing Archives
v3.0.8 · by robfelty
This plugin uses Javascript to dynamically expand or collapse the set of months for each year and posts for each month in the archive listing of your …
About this plugin
Create collapsible archives by year or month. Features include: link to archive pages, display of individual posts and support for custom post-types.
Demo
I use this plugin in my blog at http://blog.robfelty.com