Lenovo announced two new additions to the business-oriented ThinkPad family, the 14-inch ThinkPad SL410 and 15.6-inch SL510, both of which come with Windows 7.

These new ThinkPads are designed with small- to-medium businesses in mind and feature higher-resolution webcams, clearer microphones, and a microphone mute button for voice and video conferencing. The higher-end configurations for the SL410 and SL510 feature built-in 3G broadband internet via AT&T mobile broadband, as well.

Both models are available in different configurations that range from $500 to $700, the lower-end model with a 160GB hard disk drive and an Intel Celeron T3000 1.8GHz processor and the higher-end with a 250GB hard disk drive and an Intel Core 2 Duo T5870 2.0GHz processor. All configurations have the same integrated Intel GMA 4500MHD chipset, Dual Layer 8x DVD Recordable optical drive, 4-cell battery, 802.11n Wi-Fi networking, HDMI and VGA output, and multitouch trackpad.

These models also fall under Lenovo's Windows 7 Enhanced Experience Certification, which is advertised as booting and shutting down up to 56% faster than other laptops on an identical un-optimized configuration. (Haven't heard of it? Read our news post here.)

The ThinkPad SL410 and 510 are currently available through retail channels (TigerDirect, Amazon.com, and Best Buy, though Best Buy only has the SL410) as well as Lenovo's website.