Ex-libris : our blog about translation and languages (French site).

The Dutch community in France (websites in Dutch):

La Vie en France : Services for the Dutch community of France.

Nederlanders.fr : Site with a lot of ads for and by Dutchmen in France.

Frankrijkforum.nl : forum of the Dutch community with an index of services (de markt) 

Join our professionnal network:

Viadeo 
JournalDuNet
LinkedIn

Trans-fr is also present in the following online indexes:

Qype.fr: a social and cultural agenda where yuo can rate a lot of service providers in France.
La fédération des auto-entrepreneurs : index and job offers for sel-employers
Annuaire des auto-entrepreneurs.com ; index of self-employers

Online translators community:

Globtra: index of freelance translators 
Proz.com
Translator's Cafe
See also: Google local business, PagesJaunes.fr, etc.