In your question, you could clarify exactly what aspects of translation / localization you need. Do you need help extracting lines from code? Tracking the misuse of non-localizable String.Formats in code (i.e. Mm / dd / yyyy vs dd / mm / yyyy)? Help manage all resources after they are extracted? Helps manage the actual translation process while working with translators?
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Visual Studio
http://www.jollans.com/tiki/tiki-index.php?page=multilangvsnet
Sisulizer
http://www.sisulizer.com/
RGreatEx ( Resharper, )
http://www.safedevelop.com
" .NET" Guy Smith-Ferrier, ISBN 0-321-34138-4. .