The American Blow Torch Collectors Association (of which I am a proud member):
http://www.blowtorch.net/

Jeff Glass homepage gives you a lot of information on American blow torches:
http://members.aol.com/blotorches/ or www.blotorches.com

Laurent Bel has a site with mainly French blow lamps (in French):
http://perso.wanadoo.fr/laurent.bel/

Dietmar Auringer has a site with many nice German blow lamps (in German):
http://www.ewetel.net/~dietmar.auringer/

Jeanpierre Parisot has a site with many nice French blow lamps (in French):
http://jeanpierre.parisot.free.fr/

Yet another nice French blow lamps site (in French):
http://lampes.a.souder.free.fr/index.htm

Operating and maintenance instructions for US blow torches (C&L):
http://www.john-wasser.com/NEMES/BlowTorch.html

Blow Lamps Unlimited (in English):
http://groups.yahoo.com/group/blowlamps/

ForgasarForeningen (in Swedish):
http://groups.yahoo.com/group/forgasarforeningen/

Primus AB, Sweden (go to the history section):
http://www.primus.se/primus/omprimus_e.htm

Optimus AB, Sweden (no blow lamps):
http://www.optimus.se/

Otto Bernz & Co, USA (now BernzOMatic):
http://www.bernzomatic.com-aboutus

Guilbert Express, France (company history and picture of old blow lamp):
http://www.express.fr/entreprise.asp

Jangkoo Machinery, Korea (still produces blow lamps):
http://www.jangkoo.co.kr/product.htm

Rupa, India (still produces Petromax blow lamps):
http://www.eepc.gov.in/rupa/p_prod.htm

Suzhou Tower Blowlamp Co., China (still produces Petromax blow lamps):
http://www.blowtorch-cn.com/egs.htm

Light Bringer is a Finnish site mainly about pressure lanterns but you will also find one or two blow lamps (in English or Swedish):
http://willman.20m.com/index.html

Pressure Lamps Unlimited is a very informative site about pressure lamps which very often were produced by the same manufacturer as blow lamps:
http://homepage.ntlworld.com/munwai/index.htm

Skeeves Pressure Lamps is a site about pressure lamps but has also some blow lamps:
http://www.btinternet.com/~skeeves/index.html

Rodney Meyers has a brilliant lamp and lantern site, with helpful hints, restoration advice and lots of pictures
http://www.angelfire.com/ny/xrxc or http://kerolite.freeyellow.com

Terrence Marsh has a nice site about pressure lamps, stoves and irons:
http://terrence.marsh.faculty.noctrl.edu/lantern/index.htm

Herman Mulder in Holland has a site on pressure lamps, stoves and old engines:
http://home.wanadoo.nl/mulder.herman/

Classic Camp Stoves is the place to go to if you are interested in stoves:
http://www.spiritburner.crosswinds.net/index.htm

The Stove Collector is produced by author, collector, backpacker and Norwegian Terje Johansen:
http://stovecollector.tripod.com/index.htm

Base Camp Stove & Lamp Specialists have spare parts for many makes of stoves and pressure lamps:
http://www.base-camp.co.uk/

FJ-Service has new stoves and pressure lanterns as well as spare parts:
www.fj-service.dk

Bart J. Meijer has new stoves and pressure lanterns on his site:
http://de-bloeitijd.20m.com/

Toshiaki Kojiya has a nice collection of stoves (in Japanese but easy to navigate):
http://www2u.biglobe.ne.jp/~opt00l/

Tony's Lanz Bulldog Tractor Page is an Australian site about old tractors of which some use a blow lamp as starting aid:
http://www.dynapay.com.au/Tony/Lanz/index.htm

Rubens Maskinhistoriska Samlingar is another site with old tractors and stationary engines:
http://www.rubens.se/index_se.html

Tändkulans Vänner is a site about hot bulb engines using blow lamps for starting:
http://www.tandkulan.com/index.htm

Swedish inventions, including the blow lamp:
http://www.si.se/eng/esverige/inventio.html

Very useful tips on polishing of brass and other metals:
http://www.englishcustompolishing.com/

Samlaren (the Collector) is a Swedish site with many links to useful sites:
http://samlaren.se-swed.net/tn.htm

Another site for collectors:
http://www.worldcollectorsnet.com

A complete collection of links to Swedish antique related resources:
www.antikviteter.net