I like the design on the virtual thesaurus featured on awad. However it is only for english. Have anyone seen a good corpus web that includes roots or similarity across languages?

ax

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Not quite sure what you mean. (1) A multilingual thesaurus of genetically unrelated languages? or (2) a thesaurus that has entries of roots for genetically related languages. I know of neither online. Meyer-Lübke's etymological dictionary of Romance languages has entries organized by root (with all known cognates listed in the entry), an alphabetically index that points at the root entries, and a small semasiological dictionary (i.e., a thesaurus) which again points you at the roots. A medium to large sized college library should have it, though it's written in German.