Adding a text rollover to an unordered list

Hi there,

I’m making an archived list of all the posts on my site (and yes, I want it to be a tremendously long list in the format seen here):

Right now I’m displaying it using an unordered list.

What I’d like to add is a text rollover that lists the author name and post date to the right of each post title. Any ideas? I’m a CSS novice and I’m not sure how to code the template to make that specific information appear as a rollover.

Thanks.