SSL from a Microcontroller
Consider these embedded SSL libraries:

http://www.yassl.com/yaSSL/Products-cyassl.html

http://polarssl.org/

http://www.matrixssl.org/

And maybe http://gitorious.org/tropicssl/

Tropicssl and polarssl originated from http://www.ohloh.net/p/xyssl

Tropicssl and xyssl are BSD licensed, whereas as all the others are GPL with an option for a proprietary license for $.