You can browse the most-searched queries on Google Hot Trends using search results from Bing. This Google Trends + Bing mashup displays web pages, news results, images and video search results in one page.
Spezify is a new visual search engine that aggregates search results from multiples sources include Yahoo, Flickr, Twitter, Wikipedia, Amazon, eBay, etc. and then arranges all these results in a large beautiful collage.
You use del.icio.us bookmarks to save all your favorite links at one place and put tags to describe each of these web pages. Jaxly does the reverse - it helps you discover fresh stories on the web based on your del.icio.us tags.