Generally, I'd say it's always flawed to compare devices generally, without asking the question what's the PURPOSE one needs it for, so to me - without THAT - many of the Ipad vs. Kindle (or e-ink ereaders in general) debate looks like comparing apples vs. pears (pun intended).
I'll might write a bit more on that sometime, but I'd start with this interesting link
http://www.engadget.com/2010/01/27/i...allets-decide/
The essence of it is in this table:
So, talking about purposes, this comparison IS reading-wise.
As well as it is this one:
http://bits.blogs.nytimes.com/2010/0...mazons-kindle/