If there's anything we can do to make your Twilio experience better, I hope you'll email me, I'm danielle@twilio.com
Would really love to see Twilio match Tropo in these regards eventually!
<Response> <Say language="es">Es un robot que hablan español!</Say> </Response>
Also have French and Germain. Details here: http://www.twilio.com/docs/api/2010-04-01/twiml/say
If anyone at Twilio needs help when dealing with the PR numbers/needs telecom contact info/whatever, send me an email to anything @ my username dot com