Yahoo vows to encrypt website traffic

Babe 

Wonder what encryption is used.

Application layer encryption - HTTPS ?
Transport layer encryption - TLS or SSL?
Network layer 3 encryption - VPN IPSec?
Network layer 2 encryption - L2TP?

Then what type of encryption algorithm used - DES, 3DES, AES?
Then what type of key management used - ISAKMP?

Then the strength of the key.