If you have a text to be translated, these sites are great places to find a professional translator (most of them offer multicriteria search) and to ask for a quote.
For translators, they offer hundreds of valuable ressources and the opportunity to ask for help in real time when they are confronted with a linguistic issue.
They are also superb networking tools.
- ProZ.com
My profile on ProZ.com - TranslatorsCafe.com
My profile on TranslatorsCafé.com - GoTranslators.com
- GlobTra.com
- Foreignword.biz
- TraduGuide.com