Settings -> Mail, Contacts, Calendars --> then just below Signature should be the "Default Account" option.
iTunes will sync Kindle files. Go to your Device then APPS tab then point to the files from the Kindle button at the bottom of the page.
I have (and use) "Docs To Go" for the iPad. It works very nicely for PPT files.
I use excell so I'm not too sure about numbers but I think your use of the word "null" is what is tripping you up.
Substitute an empty set of...
According to advertising on HBO it wont be ready for the iPad until May 2nd. Watch the app store.
If apple kills my Kindle app I'll just unfund my iTunes account and go back to my Kindle 1.
From your picture your battery is showing 4%. I belive that wifi turns itself off when the battery is low. Give it a charge and see if that helps.
When I 1st got my iPad I made the mistake of not pushing the jack all the way into the socket. It's a little stiff so you'll have to push hard.
MobileMe not only gives you a place to store your "stuff" but also provides an email box, calendar and contact synchronization with your PC/Mac...
I use LASTPASS.
They have an app that runs on just about every mobile device you can think of in addition to PC's and MAC's.
You might also try to sync with your desktop to see if that fixes it.
I have a USB cord that works great. Don't remember where I got it. It has a male USB plug on one side and a female USB connector on the other....
Separate names with a comma.