Israeli,
( if you happen to need someone who can speak Hebrew with a Russian accent, you'll be hard pressed to find someone who can do it as well as me.)
French,
French Canadian,
Brooklynese,
Brittish,
faux Brittish
(the sort you might hear at upscale NY museums),
Indian,
Borat,
Family Guy,
Simpsons,
King of the Hill.
Telemarketing has also provided me with a wide array of different American regional accents and dialects.It was also great training for reading text with the appropriate tones.
I have an ear for dialects and speech patterns,if I can't do it, it's only because I haven't heard it enough times yet.
Coming soon, the Obama impersonation.