Greetings! I was a sort-of progenitor of Tatoeba because I played a part in making the Tanaka corpus of Japanese-English sentences available to the world (see: http://www.edrdg.org/wiki/index.php/Tanaka_Corpus )
These days my main interaction with Tatoeba is to make sure the indices on the Japanese sentences are kept in order. Once a week I download the Japanese-English sentence pairs (those with indices) and put them into the WWWJDIC dictionary system, where they are linked as example sentences for about 30,000 Japanese words. At the same time I check that the indices still match the sentences. Each week about 20 sentences need their indices modifying.
Languages: English, Japanese (not as good as it should be), French (even worse)