Let me have my posts display by doing this:

http://tvcountdown.com/

during my blog, I personally use the groups A, B, C, etc. .. if you click the letter C it runs the publish loop for those posts within the C category.

is possible?

jQuery ListNav Wordpress plugin:

http://www.ihwy.com/Labs/jquery-listnav-plugin.aspx

Demo:

http://www.ihwy.com/Labs/Demos/Current/jquery-listnav-plugin.aspx