It seems like MSI is in a hurry to get its new All-in-One products ready, as the company has already gotten up a new sub-section on its website for what MSI calls AIO PC which of course is short for All-in-One PC. It covers six different categories which consist of the Entertainment series, Aesthetics collection, Class series, Professional series, Gaming series and Wind series.
Only the Professional series has any products in it at the time of writing and the first system MSI has released the full details on is the AP1900. This is the 18.5-inch All-in-One which comes in black and silver plastic and doesn't really look that fantastic. It has an Atom N270 processor, the 945GSE chipset, most likely 1GB of RAM and an unspecified hard drive.
Other specifications include 802.11b/g WiFi, an optical drive, a Webcam, a pair of speakers, a mic, four USB 2.0 ports, a multi-format card reader, two PS/2 ports, an Ethernet port and two audio jacks. It draws a mere 35W during operation and MSI claims it's the worlds slimmest All-in-One PC design, although at 3.5cm it doesn't seem to be so thin. It can also be wall mounted via a VESA mount.
You can find the product page here