UMPC's are Business-class device for enterprise users. They run a "heavy" OS like Vista. They are optimized for office-use applications like Excel, Word, etc.

MID's are Consumer-class lifestyle devices. They runs a 'lightweight" OS with quick startup like Linux. They are Optimized for things like media playback and web surfing.

Both devices are very similar to eachother.

ASUSeePC 901 One of the leading contenders in the netbook market due to its long battery life, smaller sizing and huge community. Especially interesting for mobile users due to its size.

CPU type
Intel Atom (Diamondville)

CPU speed
1600 Mhz

Graphics
Intel GMA 950

OS
Windows XP Home

Display Size
8.9" 1024 X 600

RAM
1024 MB

Flash
12000 M

Battery capacity
49 (W/hr)

Weight
1140g

Size (w/h/d mm)
226/175/39 mm

Physical Interfaces
Ethernet 10/100
VGA
MIC-in
Line-out
USB2.0 (x3)
SDcardslot Built-in camera.

ASUS Eee Pc Surf

CPU type
Intel Atom (Diamondville)

CPU speed
1600 Mhz

Graphics
Intel GMA 950

OS
Linux Xandros

Display Size
8.9" 1024 X 600

RAM
1024 MB

Flash
8000 MB

Battery capacity
36 (W/hr)

Weight
990g

Size (w/h/d mm)
225/170/33mm

Physical Interfaces
Ethernet 10/100
VGA
MIC-in
Line-out
USB2.0 (x3)
SD card slot
Built in camera

Acer Aspire One

CPU type
Intel Atom (Diamondville)

CPU speed
1600 Mhz

Graphics
Intel GMA 950

OS
Linux Linpus Lite

Display Size
8.9" 1024 X 600

Display Type
LED b/l

RAM
512 MB

Flash
8000 MB

Battery capacity
26 (W/hr)

Weight
950g

Size (w/h/d mm)
248/170/29 mm

Physical Interfaces
Line-out
MIC-in
Multi-format card reader
VGA
USB2.0 (x3)
Ethernet 10/100