Great news for geeks – now you can access the Internet in your car. General Motors is set to unveil its first Internet-enabled Cadillac CTS Sports Sedan in April 2009.

The Cadillac Wi-Fi system uses a small device, Autonet Mobile, that allows laptops and netbooks users to access the web via a wireless LAN connection. The easy-to-use Autonet system requires no additional software, and reaches speeds up to 800Kbps. The device costs about $499, not including a monthly service charge of $29.

As the first company to offer wireless Internet in a production car, Cadillac has its eye on more advanced 3G and 4G cellular-enabled technologies.

Peek inside of the 2009 Cadillac CTS Sedan:

The 263hp CTS gives you the option of a six-speed manual or six-speed automatic transmission with all-wheel-drive system and “Performance Traction Management”. CTS comes standard with 17 inch seven-spoke alloy wheels with optional 18-inch wheels.

Features like USB connectivity, auxiliary MP3-player jacks, and a Bose audio system with eight speakers make for a pleasant in-cabin experience. On top of that, the CTS provides Bluetooth connectivity and an advance navigation system. Sweet!

At $58,280, the 2009 Cadillac CTS isn’t cheap – but it’s an excellent ride.