Plugboards are a free form of advertising. I noticed a jump in my blog views within one day of adding a plugboard here! If you scroll to the bottom of this blog you'll see a bunch of little banners, some flashing and some not. That's my plugboard, and I'd be thrilled for you to add your plug to it. What's a plug? It's a tiny banner, for this board 88x31, that you link to your blog, e-store, personal web site, etc. Click on some of the plugs and see where they take you: some will go to pages with more plug boards, some to Etsy or eBay shops, some to blogs.
Want a plugboard of your own? Try PlugMe.
Need someone to create a plug for you? Bitty Moose makes very nice animated banners.
To find more boards to plug, try clicking through some of the existing plugs on my board, or do a search for them. Warning: Plugging can be addictive.