HPCU provides educational materials on high performance computing.
The Intel Developer Zone provides courseware about HPC.
PRACE is a European organization for HPC in Europe.
The Top500 list is published biannually and consists of the 500 most powerful computers in the world as measured by performance on the LINPACK benchmark.
Supercomputing in Plain English provides workshops that explain various supercomputing concepts.
LLNL provides online training materials on several HPC topics.
Google is a search engine that indexes much of the Internet.
Wikipedia is an encyclopedia that has numerous user-created articles on a myriad of topics.
This site provides definitions of many specialized terms associated with algorithms and data structures.
Wolfram Alpha is a knowledge and mathematics information engine.
Software Carpentry introduces basic programming practices.