Finished Jiang Conrath sentence metric. Careful: If you compare grammatically different constructions, similarities will be biased negatively, since it spits out 0 for unalignable constructions (e.g. too young vs. young lawyer).
More flexible sentence set extraction logic allows only looking at occurrences of a word in certain linguistic constructions (e.g. only those occurrences of a verb in which it has a DOBJ and an NCSUBJ) - good for semantic similarity measurement.