I speak English, being born into the language.
I apparantly have a 'posh' accent, according to a number of my friends, but this might be a misjudgment of me, since I'm a little bit refined (which mainly comes from being shy), and my native accent is Oxfordian.
But, I've not lived in Oxford for over 10 years, so I don't think I have a proper Oxford accent anymore. I probably have a half-North Devonian/half- Oxford, plus those random bits I've picked up from TV and film, and my slight lisp.
Other than my native language, I can technically speak French (or am atleast qualified at a basic level in French, with a C Grade GCSE).
But I'm not very good and haven't practiced any speaking/writing/reading or listening in the past 3 years.
If you're interested in the history/power/growth of Language, then I highly suggest Stephen Fry's Planet Word, a give-part documentary series on Language.
I don't have any links to watching it, but I'm sure you can google some.
And I know it is currently available on Netflix (at least on the Xbox 360).
Here's the programme's BBC page though.
http://www.bbc.co.uk/programmes/b015h1xb