Stats
http://www.statmarket.com/

More on acronyms and abbreviations:
http://www.ucc.ie/info/net/acronyms/acro.html
http://www.acronymfinder.com/

More on jargon and acronyms:
http://sunsite.informatik.rwth-aachen.de/jargon300/

Technical terms:
http://msdn.microsoft.com/library/devprods/vs6/vc++/glossary/_whatsnew_acknowledgments.htm
http://www.cnet.bigpond.com/Briefs/Glossary/

Computer-related dictionaries/encyclopedias:
http://www.pcwebopaedia.com/
http://www.techweb.com/encyclopedia/
http://burks.bton.ac.uk/burks/foldoc/index.htm

Microsoft Site Map (courtesy Andrew Brust):
http://www.progsys.com/microsoftmap.htm

SQL Server Syntax:
http://msdn.microsoft.com/library/sdkdoc/sql/syntaxc.htm