I'm just redoing my YDC template and I've included a bit about following on Twitter, and reading the forum here. Anybody who wants to nick it is welcome, I'll paste the code in here. This opens Twitter or the forum in a new window and does not take your viewers away from your listing.

Code:
<p>
You can follow the YDC Charity event on Twitter by following 
<a href="http://twitter.com/YDC_Fundraising" target="_blank">@YDC_Fundraising</a>. 
For more information, please visit the
<a href="http://www.ebid.net/forums/forumdisplay.php?136-Charity-amp-Fund-Raising" target="_blank">Charity and Fund-Raising forum</a> 
here on eBid.
</p>
Any questions, just ask.