I wish I were one of those linguists that knows 25 languages fluently. If I were, I might know all of these:
Languages I know a little bit, but wish I knew more because they'd be incredibly useful:
Spanish, Mandarin Chinese, Hindi
Language I know a little bit, and would only be useful academically:
Latin
Languages of which I have "intermediate" knowledge and wish I were much better at:
French, Sanskrit
Languages I don't know at all, but would be useful for me academically:
German, Tibetan, Ancient Greek
Languages I just think it would be neat to learn:
Dutch, Swedish, Esperanto, Thai, Farsi, Classical Persian, Hausa, Ancient Mayan, Ancient Egyptian, Russian, C++