E-Books - Books Of the Future!

Oh Man! technology is changing so fast! see where it is landing us to - E-BOOKS!
Till now we have people of all ages who came along reading conventional books. say will u get the latest harry potter book on this e-book? definitely no. But would be possible in the near future when books will be digitized and sold to people as E-Books on the internet!
E-Book has it's own advantages and disadvantages:
Advantages:
1: Easily available and downloadable through the internet
2: Few books are free on the internet but u will have shell out your money for the rest!
3: No need to keep the lights ON for reading as the E-Book reader(PDA or the likes) has an inbuilt light in it!

Disadvantages:
1: If u don't have a PDA or some similar device, then u will have to spend atleast 7000 to 15000 for it!
2: Reading E-books causes strain to your eyes when compared to conventional books
3: U can't read for much time when u are traveling as the battery has a tendency of discharging soon.

E-books are available in a variety of format like PDF, text, etc.. and once u download it from the internet u can read it on your comp or directly transfer it your PDA. ( to open a pdf file u need to have adobe acrobat reader). Apart from these there is a software from Microsoft which is specially made for reading E-books. I don't know the name exactly but I think it's called Microsoft E-book reader.