Happy New Year! I'm starting with a couple of serach engines which I have seen reeferred to on other blogs. They are worth looking at.
FuzzFind is a metasearch "which combines the power of the leading search engines and social bookmarking sites to make it easier to locate and identify the most relevant information. All results are grouped together and sorted according to the search engine rankings plus the popularity of the sites according to the social bookmarking community". This means Google, Live Search, del.icio.us and Yahoo are searched altogether. results came through fast : try it!
Carrot is an Open Source Search Results Clustering Engine which can automatically organize (cluster) search results into thematic categories. For example you can use it to cluster together search results from Wikipedia or PubMed, or with your own chosen search tool.