It seems Sony has gone through and revamped their whole line at this point, they are all using the Santa Rosa except for the TZ Series. This is a good line up which has godo performance put into them, and this is probably the best technology before getting computers with SSD Drives. If you are looking for a laptop these would be the specifications you are looking for. SSD drives are going to improve at an exponential rate, and they will drop in price so you are better off waiting for those drives, but these laptops pack a punch.
TZ Series:

• 11.1 inch
• unltraportable
• 9 hour battery
• 80 – 100 GB HD
• 1 – 2 GB Ram

FZ:

• Santa Rosa
• Blu Ray
• Core 2 Duo
• 802.11n
• 15.4 inch
• XBrite Widescreen Display (Outputs HD Movies)
• HDMI out
• USB 2.0
• NVidias GeForce 8400M (DirectX 10)
• Express Card
• Memory Stick
• $1400 – $2000 depending on choices

AR

• Core 2 Duo
• 17,8 XBrite Screen
• 802.11n
• NVidia GeForce 8400M
• Built-in Webcam
• HDMI out
• Blu Ray -R
• Digital TV Tuner
• CableCARD Slot

SZ

• 13.3 inch
• Sprint EV-DO
• XBrite Screen
• Carbon Fiber Frame
• X3100 graphices and NVidia GeForce 8400M

Link: Engadget 1
Link: Engadget 2
Link: Engadget 3