Apparel Manufacturers:

Canopies:
ez-up.com - EZ-Up Manufacturer
berlynenterprises.com - Quik Shade Dealer
procanopy.com- Quik Shade Dealer

General Information:
Bay Area Motorcycle Resource
motorcyclegearreview.com - First hand reviews on gear
Timberwoof's Motorcycle FAQ

Helmets:
motionresearch.com - HUD for helmets
smf.org - Snell helmet rating site

OEM Parts:
cheapcycleparts.com
ronayers.com

Pucks:
sliderwoman.com

Retailers:
aerostich.com - a little bit of everything.
dexdirect.com - Cheap if you don't mind having 'em shipped from England
gerbring.com - electric apparel.
kneedraggers.com - Good people with a little bit of everything.
motonation.com - US Sidi importer
motocoolstuff.com - Stuff to help you keep cool on the bike
pitpal.com - Pricey but cool
towrax.com - Similar to PitPal
waterjets.org - Vegan Motorcycle Gear

Reviews:
motorcyclegearreview.com - nuff said.

Stands, Lifts, Etcetera:
handyinsdustries.com - Cheap stands, lifts.

Towing/Transport:
artisanmfg.com - Flush mount wheel chocks.
harborfreight.com - folding trailer w/ highway tires.
harborfreight.com - folding trailer w/ small tires.
i-hacked.com - a red light tripper that might actually work.
Supposedly mernards & nuwaytrailers.com sells the harbor freight trailer for less.
loadingramps.com - 'nuff said

Used Gear:
newenough.com
motorcyclecloseout.com - Not used but cheap