Interesting short post from RWW about how changes to Twitter's terms of service will adversely impact on the ability of scholars to use it for their research.
Labmeeting's mission is to help researchers work more efficiently. It offers researchers a web service to organize, collect, and share scientific papers.
Free back up service for all or most of your cloud-based data. Works with Gmail, Google Docs & Calendar, Picassa, Twitter, Flickr, Blogger & Zoho. I use it.
Quora's service allows users to ask questions and give answers. Additionally, users can comment on the questions and answers and "upvote" or "downvote" the answers. An "Answer Summary" can be created to reflect the consensus of the community. This summary is a wiki that can be edited by any registered user.
The School of Mathematical Sciences operates the Mathematics Study Centre. The Centre provides support to all UTS undergraduate and postgraduate students studying in various introductory mathematical and quantitative areas including statistics
Citation analysis tool for researchers to prove the impact of their research. Particularly good for people in the arts, humanities, engineering and mathmatics.