I added a keyword lookup tool to PigPog ages ago. When writing, we just stick special tags around a word or words, and a bit of code behind the scenes turns the word into a special link. The page it links to is just a list of links to search for that word on various sites – PigPog, Google, Amazon US, Amazon UK, del.icio.us, Flickr, etc. It also includes a Chitika ad unit that’s been fed the magic word to have a stab at getting a relevant ad.
If you click the little double arrow at the end of that line, you should see what I mean (on PigPog, anyway, it won’t work in RSS readers).
Also, the top part of the right hand column gets rewritten when you click one of these magic arrows, duplicating the search links, but hopefully a bit clearer for people who don’t know what the little icons mean (you might need to scroll back up a bit to see it).
Some of the links are purely there to be useful, and some are there because we make a bit of money if people follow the links and buy things.