I looked at two dictionaries. As for me http://lingvopro.abbyyonline.com/ru is more convenient. I do not like the design of this site: http://www.multitran.ru. But multitran has a lot of interesting links that may be useful. In lingvo-dictionary you can find definitions, synonyms, antonyms, a lot of variants of translations and examples. In multitran you can find specialized translations, definitions. Moreover this site has forum, where you can discuss topics that interest you. All in all both of this dictionaries is useful to translations.
