English-language Sewing Forums - The following are recommended sewing forums with membership above 1000 members

www.burdastyle.com - upward of 180000 members worldwide as of March 2009; site includes forums, shared creations, how-tos, a blog, featured members and patterns, many of which are free ; site is maintained by a subsidiary of Burda called BurdaStyle; membership is free and instantaneous following a registration procedure
www.threadsmagazine.com - site includes forums, shared creations, and how-tos; site is maintained by Taunton Press, the company that publishes the magazine "Threads"; membership size is not clearly indicated on the site, but seems relatively modest as of March 2009; membership is free and instantaneous following a registration procedure but subscription to the magazine is not included with membership;
www.thesewingforum.co.uk - site is essentially a forum site, but there is some sharing of creations, know-how and classifieds; membership as of March 2009 is slightly over 2000, mostly in the UK; membership is free but there is a screening process to enter - you have to explain why you wish to join and a moderator reviews applications;
sewing.patternreview.com - site focused on reviews of patterns and sewing equipment, but includes extensive forums about all aspects of sewing, including access to online classes and chat rooms; site provides purchase access to patterns from a variety of companies; membership is listed as above 170000 as of March 2009; membership is free following a simple registration procedure
stitchers' guild - this is part of a more extensive forum site for several crafts in and around the house (including cooking...); site is basically a forum site covering a wide range of topics for sewing and quilting; of interest, the site maintains a section for young sewers; membership is just over 4000 as of March 2009; membership is free following a simple registration protocol
forums.craftzine.com - a set of forums focused more generally towards all crafts including sewing - essentially, the site is organized by the publishers of Craft magazine; the larger site beyond the forums also provides access to a blog, a magazine (that must be purchased), podcasts, how-tos (called "projects") and a store; the size of the registered membership is not clearly marked; membership involves registering

Sites d'échange pour la couture en français (French-language Sewing Forums) - des forums recommandés ayant des nombres d'adhesions de 1000 et plus

petitcitron.com - site français qui semble être modélisé sur le format du site de BurdaStyle; le site inclut des forums d'échange, des créations des membres, des explications de technique, un blog, une boutique, et un catalog de patrons; le nombre de membre dépasse 3000 en mars 2009; l'adhésion suit une étape simple d'inscription
japancouture.forum-actif.net - un nouveau concept de forum, en français; il s'agit d'un forum qui se spécialise sur la couture japonaise; déjà en mars 2009, le forum inclut 1000 membres; le site inclut de nombreuses forum mais aussi un blog auquel ses membres puissent participer; le site semble s'orienter davantage pour des couturiers/couturières dans la région de Paris.

Schneiderforums (German-language Sewing Forums)

www.hobbyschneiderin.net - Ein deutschsprachiges Nähforum mit 43000 Mitgliedern im März 2009. Hobbyschneiderin hat Unterforen für Patchwork, Maschinenstickerei, Dekoratives, Dessous, Kinder, Kostüme, Nähen für caritative Projekte und vieles mehr.
bathinasforum.open-board.com/forum.htm