X220 is my daily driver. T23 is my second laptop that I use if I have to go somewhere where I don't like taking my newer laptop (my job takes me to some risky environments - risky for the laptop that is). A31p is semi retired and I rarely use it. Flexview is still nice to have so I keep her around.
ThinkPad X220 (4290-W1B)
i5-2520M(2.5GHz) 4GB RAM 320GB 5400rpm HD 12.5in 1366x768 (IPS) LCD Intel HD Graphics Intel 802.11agn wireless WWAN option Bluetooth 1Gb Ethernet UltraNav Secure Chip Fingerprint reader Camera 6c Li-Ion Dos license
ThinkPad T23 (2647-NG6)
Based on 2647-9RG: PIII-M 1.2GHz (512KB), 256MB RAM, 60.0GB HDD, 14.1 SXGA+(1400x1050) TFT LCD, 8x8x24/8x CD-RW/DVD-ROM, Modem(MPCI), Ethernet(CDC), IBM Secure Chip, WinXP Pro
RAM upgraded to 768MB and HD to 80GB.
ThinkPad A31p (2653-RQG)
P4-M 2GHz, 512MB RAM, 40GB HDD, 15 UXGA(1600x1200) TFT LCD, 16x10x24x/8x CD-RW/DVD, Modem(CDC), Ethernet(CDC), IEEE 1394, IBM Secure Chip(TCPA), TV out, Li-Ion battery, WinXP Pro
HD is nowadays 80GB and there's 1Gb RAM.
And the photos:


The biggest drawback of the X220: miserable screen resolution..





