A few more comments on CDs, formats, and ebooks:
Today CDs last a very long time. The CDs we use at Lybrary.com have a manufacturer guaranteed life time of 75 years. I expect the CDs to actually hold for around 100 years or longer.
I also get quite often the question about file formats and standards with the implied worry that these ebooks might not be accessible in the future.
It is very easy to remove all worries due the simple fact that ebooks are stored in a digital format. It is quite easy to copy them and convert them to other formats as often as one wishes without loss of quality or contents. If CDs really only hold data for about 100 years then all one needs to do is copy the CD after 80 or 60 years to be safe. A similar argument holds for the file format. Particularly ASCII files are readily parsed and converted to new future formats. This is one of the reasons I have chosen HTML as my basic format. I don't need any help from Microsoft or Adobe to do what I want to do and provide the best service for my customers.
I am also a firm believer that PDAs will become much more widespread and will help fuel the ebook business. But there is a second excellent use for ebooks even if one does not have a PDA and even if one does not like to read from the computer.
Use your ebooks for reference and search purposes. Many of my customers rebuy books they own in paper format as ebooks, to be able to search in them. The actual reading can then be done in the paper copy.
Say you are searching for a trick or move you can't remember where you read about it. Turn to your ebooks, search and find what you are looking for. Then go with that knowledge to your library and retrieve the book/books you want to read.
This will give you so much more value from your library because you will more often then not, find what you are searching for. I have found in my ebooks many times new things, although I thought I read these books thorougly.
So even for the computerphobics, this can be quite a help in their magic research.
preserving magic one book at a time.