Check out the Sony Vaio V505 series - $1740 to $3570 for the pre-configured ones at the Sony site. All are P4-m processors from 1.8Ghz to 2.2Ghz. A small screen though - 12.1". Only 4.3 to 5.01 lbs.
http://www.sonystyle.com/is-bin/INTE...=cpu#configure
You might also want to check out accessmicro
http://www.accessmicro.com/laptopg73...IP731A#product
They have a 4lb laptop with a P4 2.4Ghz, 15" TFT XGA screen. I configured one on their online screen for ~$1270. 512MB PC2100 DDR, IBM 40gb Tstar HD, WinXP Pro, SiS650 chipset with embedded 3D engine, 8x8x24 CD-RW/8x DVD-ROM Combo Drive, Onboard full duplex 10/100 Base-T ethernet, 4 USB 1.1 (drawback), 1 1394 firewire port, TV & VGA out...
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