Need Help with a WP Bio-Box Plugin or Script

A friend of mine wants a bio-box for her blog. It's Wordpress platform and the plugins available that she's found to date are not up to scratch.

As she has guest writers once a month, she wants to be able to place a bio-box below their posts only, which would include a short bio/photo/social network links

Here's a link to Adrienne's post, it might explain better what she's looking for if there's someone here who knows or can write a script or plugin.

Thanks