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Clarinet Research
http://test.woodwind.org/Search/index.html?klarinet_index=klarinet_index is a site that I refer to when I have questions about obscure clarinets. People are happy to share info and they have a huge data base of Q and A.
Clarinet Serial Numbers
http://www.musictrader.com/serialnos.html is a great site for those trying to find approximate dates for their instruments, both woodwind and brass. However, the numbering chart for Conn instruments is more accurate at http://www.xs4all.nl/~cderksen/ otherwise known as 'The Conn Loyalist".
Boehm, Albert, and Oehler Fingering Charts - Here is the best site I've found for fingerings charts, including, trills and alternate fingerings: way more than I ever wanted to know! http://www.wfg.woodwind.org/clarinet/
http://orgs.usd.edu/nmm/News/Newsletter/August2010/ClarinetSoreThroat.html - interesting article about various solutions to the stuffy throat Bb on Boehm clarinets!
My Ebay Stuff Takes you to my current auctions; woodwinds, the occasional brass instrument or accessory, maybe even an oriental rug - who knows? http://shop.ebay.com/jeremy1240/m.html?_nkw=&_armrs=1&_from=&_ipg=25
The 'Big 3' 
Websites for the 'Big 3' woodwind manufacturers:
Buffet http://www.buffet-crampon.com/en/index.php
Leblanc http://www.gleblanc.com/
Selmer http://www.selmer.com/
Yes, they all made fine clarinets, no argument, although Buffet shows inconsistencies in quality control due to insufficient aging of wood and volume of manufacture. However, if you're looking (as I am) for the hidden gems at lower prices, please click on our friend here...
Reeds and other Stuff
http://www.ramonwodkowski.com/ - Ramon specializes in vintage mouthpieces and refacing, and knows more about old mouthpieces than anyone should...
http://www.music123.com/productDetail/productDetail.jsp?entSkuId=462672000775000&source=ZWBZWXX - The best price for Fibracell reeds that I've found.
www.andyspianoservice.com - My friend Andy's site for piano tuning, parts, and restoration here in Lynchburg VA.
http://sonoransax.com/index.htm - A website based in Arizona from one of my customers, handling recent and vintage pro saxes!
http://www.heneberrychiropractic.com/ - One of the best chiropractors I know....
http://www.essortment.com/hobbies/clarinetreeds_szls.htm - a nice essay about reed design!
http://www.fibracell.com/Paul%20Coats.htm - a nice review of Fibracell, my reed of choice! You can get these on Ebay, WWBW and other sites as well. They last for weeks, don't require wetting, and sound/feel more like natural cane than Plasticovers.
www.vandoren.com/en/clarinetreed.html - The biggest name, if not always the best reed...
www.gonzalezreeds.com/ - Another good reed.
http://www.superial.com/home.html - Alexander reeds are wonderful!
http://www.wwbw.com/Rico-Plasticover-Bb-Clarinet-Reeds-462693-i1143600.wwbw - Yes, Plasticover reeds! Long lasting, nice bright sound (for you jazz players out there) great for doubling as they don't need wetting. The site is a bit overwhelming, but they do have a lot of good stuff at competitive prices.