Google CSE implementations

http://google.com/coop/cse/examples/GooglePicks lists out new Google CSE implementations.

Kosmix

http://www.kosmix.com meant for specific subject domain

ProProfs

ProProfs WebSchool www.proprofs.com/webschool , a user generated tutorial directory, where you can find links to various on-line tutorials on technical subjects, may serve as a good resource for picking up computing skills.

Slide Share

Slide Share http://slideshare.net/ the on-line service, developed for enabling netizens share/discover slide shows on different subjects

Swivel

Swivel is user-powered service, where users can upload/share the content. Here, you can upload any data, explore it graphically and share it with others.
http://www.swivel.com/

OpenDOAR

http://www.opendoar.org/index.html
good place to locate several open content sources.

Decipho

When you invoke a search, you can specify whether it is for shopping or research or both. Another feature is the subject-specific clustering of the results. For instance, if you start a search on statistics, the service presents you categories such as `Statistics online,' `Glossary of statistics,' `Stats' and `Math Statistics.'
http://decipho.com/

Google Notebook search

Google Notebook helps us easily clip web content, add notes or comments and store it online. Also, one can make her notebook public and share the contents with others. Now, Google has started a search service for finding information available on public notebooks.
http://www.google.com/notebook/search

SearchMash

http://www.searchmash.com
Alongside the usual search output (results are similar to those of Google, but each is numbered), the service provides options to get search output from blog, image and video sites as well.