The EeeMedia system is described as a "High Definition Entertainment Center," and offers an 800MHz ARM-based Samsung processor, 512MB of RAM, a 2.5-inch hard drive, 802.11b/g/n, 10/100Mb/s Ethernet, and a remote control. It's also said to consume only 10W of power.
Being a media center and all, it's only natural that the EM501 can handle HD content in a variety of formats, including MPEG1/ 4, H.264, WMV, VC-1, DivX, Xvid, VOB, and MKV. It also supports a range of audio and image files.
The Eee Box EB1501U appears to be an updated EB1501, and carries two USB 3.0 ports. Most of the other specs appear to be the same though, including a dual-core 1.6GHz Intel Atom 330 processor, Nvidia Ion graphics, 2GB of RAM, up to 320GB HDD, 802.11b/g/n, HDMI-out, and Windows 7 Home Premium.
Asus hasn't revealed pricing or availability.