SICP in ePub format
If you want to read
SICP (and you should!), on the iPad, then you are in luck. The digital format is old school HTML pages generated from texinfo. While there is nothing wrong in that format per-se, it just doesn't allow you read this wonderful book on an iPad (or another other tablet for that matter).
iBooks uses
ePub as the ebook format. Just download SICP in ePub format from
here (Ian Eure's git tree),
add it to your iTunes library and sync. That's it.
The link shared above is a git tree on github and it's always nice to fork and fix any issues that you find. The actual download link is also present on the github project.
SICP on other devices
If you have a Kindle, then Jonathan Patt's
sicp-kindle git tree on github is the place to go. I don't know much about Kindle (don't have one), and instructions are from
http://irreal.org/blog/?p=274
PDF version
Finally, there is always the PDF version that you can download from
http://sicpebook.files.wordpress.com/2012/11/sicp.pdf
Paperback Edition of the SICP
Of course, another option is to get the dead wood edition from MIT press directly -
http://mitpress.mit.edu/books/structure-and-interpretation-computer-programs. Then again, having a paperback or hardcover is nice if you have a personal library shelf. I learnt that this can be a pain esp. when moving/changing houses because you will need to pack everything up and unpack them once you are in your new place.