The best search engine for things mysterious is

ClueLass Home Page

 

Mystery Magazines

Alfred Hitchcock Mystery Magazine

Black Mask (dedicated to the old pulps)

Crimespree Magazine

Crime Time (British)

Mystery Readers  Journal

Shots (excellent British e-zine)

I Love a Mystery 

The Ellery Queen Mystery Magazine (EQMM) 

Over My Dead Body

Mystery Scene

 

Conferences/Events Sites

 

Bouchercon 2012 (Cleveland)

LeftCoastCrime 2013 (Colorado Springs

Malice Domestic 2013

Mystery Events - a Calendar of Crime

Mystery On-Line Website

ThrillerFest 2012 (New York City)

 

North American Publisher Sites

Avon

Bantam Doubleday Dell  

Crippen & Landru 

HarperCollins (US): First Look at the Crime 

Henry Holt

Hyperion

Mira

Morrow (William Morrow)

Mysterious Press/Warner Books 

PenguinPutnam 

Perseverance/Daniel Publishing

Poisoned Pen Press 

Random House 

Rue Morgue Press

Simon & Schuster Mystery Authors 

Soho Press

St. Martin's Minotaur 

 

British Publisher Sites

Allison & Busby

Constable Crime

HarperCollins 

Headline

Hodder & Stoughton  

Orion 

Piatkus

Macmillan

Random House U.K (Includes Century)

Severn House

Transworld (U.K.) Includes Bantam, Corgi and Doubleday

 

Crime Fiction Organizations

Sisters in Crime

Mystery Writers of America

Crime Writers of Canada

Crime Writers Association (UK)

The Independent Mystery Booksellers Association

 

General Mystery Links

A&E Network Mystery Site 


Archive of Detective Fiction 


The Bastulli Mystery Library 

Bookreporter.com (Suspense/Thriller Writer spotlight)


Bookweb's Booksense 76 Bestseller Lists 

Crime Thru Time (history mystery) -- very good


The DorothyL Homepage


Ellery Queen, a Website on Deduction 


Stephen Gauntt mystery site 


The Gumshoe Site 


The Mysterious Home Page 

Mystery Booklovers


The Mystery Reader 


The Mystery Vault 


Mystery Writers' Forum


Nancy Drew 


The Online Mystery Network 

The Rara Avis Home Page


The Serial Killer Info Site 


Serial Killers 

Stop You're Killing Me


Tangled Web UK  (Great resource about what is going on in the U.K)

The Thrilling Detective