I also have a Kindle2 and was seriously tempted by the Kindle DX. Also tempted by the Nook, as I have loads of ebooks from years of using Palm PDAs and Treos. I don't think that is available for the UK yet.
Now the iPad has been announced, I am thinking of waiting for that - although it never seems wise to go straight for the Mark I of anything.
One thing which I find disappointing is that it seems there will be no GPS on the non-3G versions of the iPad. With the larger screen and a built-in GPS, the iPad would make a superb navigation device, especially for people like me with failing eyesight. Of course, it might look rather silly attached to the dashboard or windscreen of my car, but for walking it might be good. Then again, walking around the streets with an iPad on show might be a little too tempting for thieves.
As for ebooks, I assume the iPad will run the Kindle for iPhone app? Otherwise, I end up buying and using ebooks for the eReader (Palm or Nook), ebooks for the Kindle, ebooks for other ereaders (the ones where you need Adobe Digital Editions to transfer the ebooks) and then another different set of ebooks for the iPad ereader. All of them can be used on the iPhone (and therefore presumably on the iPad) with the appropriate reader app.
Is there any more information about release dates please? I think they said March - are we talking beginning of March or later than that?
Edit - a greatly reduced price for the Kindle DX might stir things up a bit