AboutThisDay.com is a date based 'on this day in history' style search engine of facts like births and deaths of people, events and holidays. You can refine the results using year range and category filters and the results are sorted using a home-grown popularity algorithm
Using RhNav - Rhizome Navigation I wrote a data aggregator for Technorati's API. The first result is a video which visualizes blog domains by analysing Technorati's Cosmos (the blogs which link to a particular URL). The video is a screencast of RhNav fetc
M. Viswanathan, T. Whangbo, K. Lee, и Y. Yang. ICCS '07: Proceedings of the 7th international conference on Computational Science, Part III, стр. 701--708. Berlin, Heidelberg, Springer-Verlag, (2007)