I have been looking for something like what Plaxo does - which is to allow users to add names to viral marketing items whether web pages or other widgets site users might want to share with people via email. Luckily I found this article and just wanted to share. I agree with the author and although the convenience is nice I don't want to be responsible for enticing visitors to download anything tagged as borderline intrusive.
sexywidget.com/my_weblog/2007/01/enterprise_widg.html