Limit layered navigation to X values and show a more/less link.

1. Download the files and copy to your Magento installation folder.
2. Clear Magento caches.

cd /path/to/magento/
modman init
modman clone https://github.com/eyemagine/Magento-LayeredNavLimit.git

The limit of items to be shown will default to 5. This can be changed in System > Configuration > Catalog > Layered Navigation > More/Less Limit.

This module requires the jQuery javascript library.