Lexicology, Lexicography, and English dictionaries online

Lexicology

Lexicography

OneLook Dictionary Search (links to many online dictionaries)

Longman Web Dictionary (British and U.S. English)

Cambridge Web Dictionary (British English)

Oxford Advanced Learner's Dictionary (British English)

Merriam-Webster's English Dictionary & Thesaurus (U.S. English)

Merriam-Webster's Learner's Dictionary (U.S. English)

Lexico Publishing Group's dictionary products (largely U.S. English, including dictionary.com)

American Heritage Dictionary of the English Language 

Encarta Dictionary (on aspects of world Englishes; some inaccuracies)

Urban Dictionary (Dictionary 'with an attitude')

WordSpy (Top 100 words)  

Linguistic terms explained (frightened of the jargon that linguists use? Consult the following:)

Linguistic Glossary (Lexicon of specialized linguistic terms by the Summer Institute of Linguistics)

Lexicon of Linguistics (Utrecht's University Linguists explain the meaning of linguistic terms)

Some leading centres for the study of the lexicon

Australian National Dictionary Centre (ANDC Schools Dictionary Project -- 
It's easy to make a dictionary!)

The FrameNet Project (at UC, Berkeley)

Corpus Linguistics, and corpus-based projects/resources:

Corpus linguistics

BNC Online

Cobuild Direct Concordance Sampler

Bank of English - BoE

Lancaster University's Centre for Computer Research on Language

University of Birmingham Centre for Corpus Research

ICE - International Corpus of English

ACL Corpus Resources

Manuel Barbera's links on corpora and corpus linguistics

Computational Linguistics & Linguistic Programming

Association for Computational Linguistics (the definitive site for computational linguistics)

PROgramming LOGic (An Artificial Intelligence, 'declarative' language)

The Oz Programming Language (Alternative to PROLOG; this was suggested to me by Dr Martin Henz of the School of Computing)

A tutorial in UNIX (UNIX is the powerful multiuser, multitasking operating system)

Another tutorial in UNIX

Natural Language Software Registry  (A select list of linguistic software tools)

Some other leading institutions for the study of computers and language

Istituto di Linguistica Computazionale (Institute for Computational Linguistics at Pisa)

Dept of Language Engineering (at the University of Manchester Institute of Science and Technology, UMIST)

Natural Language Processing Research Group (at the University of Leeds)

Systemic Meaning Modelling  Group (at Macquarie University)

Information and Communication Technology (ICT; IT and Learning)

What is ICT?

Another site on ICT objectives 

Information Technology education in Singapore (Visit the Ministry of Education's homepage on I.T.)

I.T. at the National University of Singapore (This gives you an idea of the I.T.setup at NUS)