Biology

http://lsvl.la.asu.edu/resources/mamajis/

http://biology.about.com/

http://www.ncbi.nlm.nih.gov/

Chemistry

MSc info/

http://chemistry.about.com/

Mathematics

http://www.mathsoc.warwick.ac.uk/index.php?pid=4&w=1024

http://www.warwick.ac.uk/MathStuff/

http://ltsn.mathstore.ac.uk/contents/index.shtml

C++ programming

http://cplus.about.com/library/blcplustut.htm

http://www.sgi.com/tech/stl/

http://www.stack.nl/~dimitri/doxygen/

Introductory Information

http://www.howstuffworks.com/

http://www.about.com/

Search for papers

http://www.biophysj.org/searchall/

Magazines

http://www.nature.com

http://www.newscientist.com/

http://www.americanscientist.org/template/CurrentIssue

http://www.nationalgeographic.com/

News

http://news.bbc.co.uk

http://www.timesonline.co.uk

Here are a few links which I have found useful. I hope they prove of some use to you too!