Pedal Manufacturers 

Behringer

These look like cheap version of Boss to me. Never tried one, so can't be sure.

Boss

One of the most popular quality pedal purveyors.

Damage Control

Quality bits of kit from the Peavey fold.

Danelectro

Haven't tried any of these, but they've got funky names like "French Toast".

DigiTech

hmm..

DOD

I know nothing... certainly a classic brand, and related to Digitech according to wikipedia.

Electro Harmonix

Stable of the Big Muff.

Fender

Even Fender make 'em

Fulltone

High quality pedals

Ibanez

Another broad range of pedals

Jim Dunlop / MXR

Home of wah wah, Dunlop and MXR pedals.

Line 6

Know nothing about these either!

Marshall

Marshall make some solid pedals in addition to their amps - most famously the "Guv'nor".

Moollon

Top quality pedals. Made in Korea with remarkable US-style metal work.

Morley

I know nothing about these guys!

Pro Co

Creators of the infamous "Rat".

Robert Keeley

High quality pedals and modifications to other brands

Roger Mayer

Started out making effects for Jimi Hendrix. Some fantastic spaceship shaped pedals.

Tech21 NYC / Sansamp

I've heard some good things about Sansamp...

Visual Sound

Spotted a Visual Sound "Jekyll & Hyde" pedal being used by a band - bought one on ebay, it rocks!

Voodoo Lab

Quality pedals, including the "Superfuzz".

Zoom

Multi-effects masters

Fan & Review Sites 

Boss Area

Everything you could ever need to know about Boss pedals. Includes handy ebay related forum.

"Effects" Squidoo Lens

Another Squidoo lens on the subject

Electro Harmonix Squidoo Lens

Another Squidoo lens, but solely focussed on Electro Harmonix

Harmony Central

Links galore to pedal manufacturers, modifiers, build-your-own sites etc. Also contains a forum and reviews.

Effects Database

A wealth of information, includes some brands that are no longer made.

"Guitar Pedals" Flickr Pool

Pedals galore!

"Stomp Boxes" Flickr Group

As above, but more focussed on the beloved stomp box.

"Pedal Boards" on Flickr

Pedal board porn

Noise On

Lots of reviews, pics, sound samples etc.

Guitar Geek

Find out what gear your favourite bands use. Not as up-to-date as it could be, but good info for the technophile.

My Little Collection 

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Pedals Of Yesteryear 

Univox

A fan site with lots of info about the Univox brand. Most famous, I think, for their Super-Fuzz.

Where To Buy 

Electrohill

North London guitar specialists

eBay (UK)

All but one of my pedals has come from here. Pedals are usually very well built, so no problem to pick them up second hand. (See below for US eBay)

Build Your Own 

TonePad

A wealth of information and equipment for DIY fx enthusiasts

Schematic Heaven

Electrical schematics for hundreds of pedals

Guitar Pedals on eBay 

Fetching new data from eBay now... please stand by