There are many services out there that offer widgets you can embed into your own web site layouts. How do you know which ones are the best? Well, I am not an expert. Since this is the Internet though, I can pretend.
Here are my top 10 favorite widget related web sites.
Widgetbox – Tons of free widgets to put on your site.
LinkWithin – Post related stories and thumbnails on your web site.
ShoutMix – Free shoutbox/tagboard chat widget.