If you really need windows to read PDF, MS LIT or practically any format you may want to consider the ASUS eee PC 1000HA available at JR.com
http://www.jr.com/asus/pe/ASU_EPC1000HW1X/ It is $419 with free shipping plus a $40 mail in rebate bringing it to less that many eBook readers. Rebate ends at the end of the month of December.
It has a 10" 1024x600 screen and the display can be rotated to portrait mode for full page reading (CTL-ALT-any arrow key). This unit is not a stripped down Linux model but includes 1 Gig of memory and a full copy of Windows XP SP3 preloaded on a 160 GB hard disk. It uses an LED backlight and if you keep it turned down a bit they claim more than 7 hours of battery life. The unit weighs 3.2 lbs. WiFi is built in.
Dale