Eagle-eyed readers may have noticed that one of the deals of the day this afternoon was for the Lenovo IdeaCentre C300 all-in-on desktop. And that means this computer, which was first announced in May, is now available and shipping.

The folks at Nettop Review have already managed to get their hands on one, and have posted a series of unboxing photos. The PC looks pretty good and has a decent assortment of ports. Somewhat surprisingly, it ships with a PS/2 keyboard instead of a USB model. I’m not surprised that this PC, which sells for as little as $400, comes with a wired mouse instead of a wireless one, but it’d look even nicer without that mess of wires hanging out in the back.

The C300 comes in a variety of configurations. The base model has a 1.6GHz Intel Atom 230 CPU and integrated graphics. But you can also get a pricier model with a dual core Atom 330 processor and and ATI Mobility Radeon HD 4530 graphics card.

Lenovo is the latest computer maker to decide that netbook innards look pretty good in an all-in-one desktop. Following the lead of Asus, Acer, MSI, and Shuttle, today Lenovo announced an all-in-one desktop PC with a 20 inch widescreen display, 1.6GHz Intel Atom 230 CPU, Intel 945GC chipset. The Lenovo C300 doesn’t have a touchscreen like many of the low power all-in-ones from other companies. But what it does have is a low price. It starts at just $449.

The computer also has an optical disc drive, which is something you won’t find on some of its competitors. The C300 also features 1-2GB of RAM, a 160GB to 640GB hard drive, and a choice of Windows XP, Windows Vista Home Basic, or Windows Vista Home Premium. It has a 1.3MP webcam, 6 USB ports, a 6-in-1 multimedia card, a Firewire port, and includes a USB mouse and PS/2 keyboard.

Like the Lenovo IdeaPad S12 mini-laptop, which was also announced this morning, the Lenovo C300 should be available in July.