My computer (pc) crashed so I bought a new one and authorized it.  Downloaded itunes, synced my ipad and it only copied some songs and no apps.  How do I duplicatethe data on my ipad to my new computer.  Plus I purchased mobileme and my calendar is not sy

my pc computer crashed so I bought a new one and autorized it.  Downloaded itunes, synced my ipad and it only copied some of my sngs and no apps.  How can I download my ipad to my new computer

You can re-download your apps and ibooks purchases via your purchase history in iTunes on your computer (assuming that it's version 10.3+), and if you are in the USA then you can also re-download music I think - more info here http://support.apple.com/kb/HT2519
For music that you ripped from CDs or bought from a source other than iTunes then, assuming that you made/maintained one, you can copy them from your backup - and backups are relatively easy to maintain, so there is no reason not to have one (especially as content is occasionally removed from iTunes so isn't always available for re-download). Otherwise there may be third-party programs that can copy them off the iPad, but you can't do it via iTunes - this post from a year ago was about iPod/iPhone to computer utilities but some might work with the iPad : https://discussions.apple.com/message/11646661?messageID=11646661&#11646661 .
If you've got content in other apps that you want to copy back to your computer then you might be able to do via the file sharing section at the bottom of the iPad's apps tab in iTunes, or they might have wifi transfer capability.

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