Slim, trim and amazingly fast the ThinkPad T400 notebooks are IBM’s hottest new notebook.  With practically every feature imaginable, this upgrade of the T30 seems to have it all. This series offers an original design, excellent performance and a long list of must-have features.
The IBM ThinkPad T40 has an extended battery life, allowing you to work unplugged for up to 9.5 hours. This is due to the high-capacity, Ultra-bay Slim Li polymer battery. In addition to the longer battery life the ThinkPad includes the Ultra-Connect Antenna. This feature improves signal reception, allowing you multiple types of Wi-Fi Readiness.
The list of features for IBM’s latest notebook include a big screen, a modular bay with the capacity to host a  DVD-ROM/CD-RW drive, a zip drive, a second hard drive or battery, or a floppy drive. You will also have the ability to specify an 80GB hard drive and up to 2GB of system memory.
On select IBM ThinkPad models, Think Vantage Technology is preloaded allowing for the Embedded Security Subsystem. The software assists you in lock private information and safeguard data with encryption.  Another preloaded Think Vantage Technology that comes with this system is Rapid Restore PC. This technology gives you the power of one-button recover and restore. This makes it much easier for mobile users to troubleshoot any situations that may come up saving time and frustration.
Other software that is pre-installed include: Norton A/V trial-ware, Windows XP SP1, the IBM updater and Access Support, IBM record-now and Acrobat Reader. All of the models have dual USP 2.0 ports, dual PCMCIA ports, S-video out, a full sized keyboard  as well as Pentium M 1.6 Ghz, Intel Pro 1000 gigabyte Ethernet chip-set, 56k V.92 modem. This product is durable, remarkable fast and cooler running.  This ultra-thin notebook packs power and performance into a 4.5 pound package.  The ThinkPad comes with a three-year warranty and one-year warranty on the battery.