I purchased a
Kobo E-Reader a few weeks ago. This is a basic no frills E-Reader which uses E-LInk technology and is much cheaper then a Kindle et al. With the much cheaper price, there is no wi-fi etc which is ok with me.
The e-reader has a 6" (diagonal) screen and is much easier to read then my HTC Hero phones' small screen or my netbook or laptop back-lit displays.
The e-reader has on board capacity of approximately 1000 books which can be expanded to about 5,000 total with the included SD card slot. The battery life is phenomenal and I have yet to re-charge it since the initial charge 3 weeks ago despite reading every night at bed time.
One great aspect of this e-reader is I can purchase books from the website and read them there online or from the e-reader or my HTC phone.
I usually read 3-4 books concurrently and having not to cart around 2 or more books in the backpack saves a lot weight and room as the e-reader is about the size of a large paperback and is just shy of 8 oz in weight and only 3/8" thick.
If you has asked me a year ago if I would purchased an e-reader (of any brand), the response would of been no. So far, I love the e-reader and now cannot foresee purchasing another hard or soft cover book, save for specialized manuals etc.