This blog is one of the most proactive in testing web 2.0 software. Excellent ressource.

Mashable is a blog covering social sites and Web 2.0 startups. http://www.mashable.com/

A reference for online collaboration and web 2.0 in France

http://3spots.blogspot.com/ has a lot on social bookmarking and blogging tools.

A new form of self-expression that connects people through visual symbols (personal tags).

Information intéressante, divertissante sur le web !! Vidéos inusités, meilleures nouvelles de digg.com, actualités

TechCrunch, founded on June 11, 2005, is a weblog dedicated to obsessively profiling and reviewing new web 2.0 products and companies. In addition to new companies, we will profile existing companies that are making an impact (commercial and/or cultural) on the web 2.0 space. TechCrunch is edited by Michael Arrington, who also writes a companion blog, CrunchNotes.

Excellent, required reading.

http://www.genbeta.com

Juan Diego Polo's web 2.0 blog - in Spanish

http://utilidades.bitacoras.com I think is one of the best spanish blogs of blogging and Web 2.0

Web social que contiene noticias de tecnología, ciencia, hardware y software, sociales y ocio. http://tecnoticias.crispynews.com

Compare ask results side by side with results from major search engines.

http://ask-swicki.eurekster.com/

http://noticiero.zoomblog.com

Focused on web marketing strategies and tactics, particularly the use of Web 2.0 design and social tagging resources, at http://webmarketcentral.blogspot.com.

Outilstuces is a good french site with web 2.0 and Ajax address

Site 2.0 que apresenta vídeos variados enviado pelos usuários que também comentam, votam e selecionam os melhores vídeos da internet. http://www.ortubes.com