I've always had a pretty low opinion of the Search Engine Optimization industry. Though there are of course legitimate experts in the field, it seems chock full of people who are barely above spammers, and they taint the image of the whole group.
Blog comment spam is one common type that bloggers know all too well, but creating tons of rubbish content is another type of spam.
HotNacho hires writers to write low quality articles for $3 each. The articles, being of low quality, have little value by themselves. However, if you can get an authoritative site to host the articles you can make a ton of money from advertising.
Still need some work on the world markets though ;) Fast.ol
Since some of the top ranking search results are owned by competitors (such as Yahoo! Finance) it probably does not hurt Google to keep the visitors at Google by providing a bit more data in the search results.
Also, Google changed their logo for Vincent Van Gogh today. You gotta wonder if the person advertising for that term is going to see a huge traffic spike and lowered ROI on the day.
If I were an aspiring artist who had a few bucks and was trying to promote myself today might be a good day to get some exposure. One of my friends is an artist and a while ago he got to meet Pablo Picasso.
Website Dating: My Density shows first and second degree relationships between websites.
The interface could be a bit cooler and smoother (perhaps if they used a bit of AJAX and ensured the text was easier to read on scroll overs if they are showing a ton of data in a small area), but it looks like a cool idea. more info about My Density and even more info here.
I saw this mentioned a while ago, but I think I forgot to link to it. Essentially it allows search results to be reformatted & reappear elsewhere. Robin Good has more about why he feels it is important.