Wallswaps.com is a great site created by the people at Erskine Design.
The principal is simple, just send them some stuff, any stuff, and they will send you one of their badges and then put your stuff on their wall for all the see. Not only is this a great idea for Erskine Design to promote their agency but it is also a great way to promote what you do too.
I sent them three posters of my automotive artwork and some business cards.
This is my badge.
As far as web design goes, I think they did a great job with this site. It has a really unique design. Go ahead and send them some stuff.