Dell last week introduced its D-series Latitude laptops, all of which are based on Intel's new Centrino technology. The D600, out now, replaces the C640 and C610 as Dell's mainstream range, while the D800, due next month, replaces the C840 high-performance range.

All models feature built-in smartcard readers and Gigabit Ethernet as standard, while the D800 boasts a wide-aspect 15.4in screen capable of displaying up to 1920x1200 pixels.

IBM launched its ThinkPad T40 and X31, new mainstream and ultraportable models respectively. Models not carrying the Centrino brand will ship with dual-mode 802.11a/b WLAN adapters, the firm said, and all wireless models will include IBM's embedded security chip to accelerate encryption tasks. A T40p mobile workstation also features Gigabit Ethernet as standard.

Toshiba is one of the few vendors shipping an ultra-low-voltage Centrino model. The Portégé R100 looks similar to last year's Portégé 2000 ultraportable, which it replaces. The supplier also announced two new corporate Tecra ranges; the Tecra M1 replaces the Tecra 9100 and will be partly build-to-order, the firm said. The Tecra S1 features a 15in screen and is being promoted as a low-cost rival for Dell systems. Both ranges have optional Gigabit Ethernet support.

Sony will today introduce its Vaio PCGZ1SP and PCGZ1MP with 14in displays. Both models feature integrated Bluetooth and WLAN connectivity.

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