I too speak TAMIL, bcoz its my mother tongue and its the OLDEST of all lang not to mention it sounds sweet and heavenly to me , i would like to learn japanese, french,chinese
I can also teach what I know but the list you selected is what I plan to learn in the future, maybe I can teach them ten years later
I'd like to speak russian and french. And maybe some spanish / portuguese. I'm currently only capable of German and English (which is normal for germans, nothing special.. everyone speaks german in Germany - and English as well, its the world-language).. I understand and speak vietnamese as well, but with a few drawbacks.. and I have latin in school, not really worth mentioning cuz latin is a dead language which is not spoken anymore (just in case u don't know)
I believe that French is the most popular second language I like to share an "open source" Spanish book. The writer whares them on his own site. http://www.donpotter.net/Spanish.htm
My native language is Spanish, but due to my online life, my english is almost perfect. If you consider writing as "speaking", most of the time I speak english. I also know a little bit of Portuguese, French and Russian (language of my ancestors), even though I was never intested in it. I'd like to Improve my french and learn some japanese (I would like to live in Japan some day).
I speak English, Spanish, Thai, Hebrew, and Mayan Fluently. Not so fluently i can do ok in Portuguese and Italian.
I would settle for a good command of English vs American Seriously speak a fair amount of Portuguese. As I like to say, I speak more than enough to get into trouble, not enough to get out of it.