Lenovo has finally made a move into the modern tablet market today with the introduction of not one but three new slate devices. The Android-powered IdeaPad K1 and ThinkPad tablets are set to debut in August, while the IdeaPad P1 to arrive at an unspecified date later in the year running Windows 7.

The IdeaPad K1 starts at $449 for the 16GB Wi-Fi version or $500 for the 32GB model (3G pricing has not been set) and is basically a LePad dressed up in Android. It packs a 1GHz Tegra 2 processor, 1GB of RAM, a 10.1-inch (1280 x 800) capacitive touchpanel, Android Honeycomb 3.1, and a two-cell battery good for "up to ten hours" of use.

Other features are pretty much par for the course compared with other Android tablets: a 2-megapixel camera on the front and a 5-megapixel camera on the back, a full SD card slot and support for full-sized USB input. In terms of design it has a silver exterior and rubberized back all in a form factor that's 13mm at its thickest point and weighs 1.6 pounds. Lenovo has thrown in a few software tweaks in addition to 40 or so apps including Netflix -- a first for Android tablets.

The real star of the show, however, is the ThinkPad. Lenovo's business-oriented tablet offers an affordable ($30) digitizer pen, 2GB of cloud storage, a built-in Windows 7 file copy and syncing tool plus a ton of built-in 3rd party apps, and a 1280×800, 16:10 IPS screen covered with Gorilla Glass. There's also an SD card slot, dual cameras, mini HDMI out, USB 2.0 host, micro USB port, a SIM card slot, Wi-Fi, and a dual-core Tegra 2 processor.

As you'd expect security features are aplenty for the enterprise crowd it targets, including SD card encryption, lost device disablement and anti-theft software. The tablet ships with McAfee and features layered data security as well as support for Cisco VPN. The ThinkPad will first launch in Wi-Fi only versions, priced from $479 for the 16GB model sans digitizer pen and $509 with it, with the 3G version expected to go on sale shortly thereafter.

Lastly, the arguably less exciting, Windows 7-based IdeaPad P1 touts a 1.5-GHz Intel processor, 10.1-inch (1280 x 800) display, can support up to 2 GB of DDR2 memory and up to 64GB of SSD storage, and will come in both Wi-Fi and 3G versions when it hits the market. It also sports and optional stylus and has plenty of connectivity options.