there's a plugin called Listento that does exactly what you want.. it lets you link to a dynamically updated image that displays info to your specifications.. the image can range from simple text to a graphic made to look like a winamp skin and many other themes..
http://www.listen-to.comyou'll have to sign up (free), then download the codec for foobar.. it's outdated but it has continued to work for me.. also, there was an error in the instructions when i downloaded it (not sure if they've fixed it, but i did draw their attention to it) and i had to search alot to find the correct submission info for the plugin.. so to save you the hassle, here it is

submission site url: www.listen-to.com
port: 80
path to submission page: /postmp3.php
service to use: Listen-to
submit string:
CODE
USER=$USER&TITLE=$TITLE&ARTIST=$ARTIST&LENGTH=$LENGTH&PASS=$PASS&YEAR=$YEAR&GENRE=$GENRE&ALBUM=$ALBUM
(this is the info you enter on the Dynamic Image Update page that will appear in the preferences dialog)
i've noticed that this plugin can cause foobar to lock up for about 30 seconds on track change.. this tends to happen only during peak usage hours, in my experience, and as long as you don't try to do anything right after a track change it's never noticeable..

hope that helps
peace,
bogsnarth