1. Message center is stored on SIM card. You won't need that. As for the settings for MMS/Internet you should write those down form Settings - > Wireless Controls -> Mobile Networks -> Access Point Names. Or use some backup app from market to save those.
After factory reset you'll need to re-enter your Google credentials and the phone will resync your contacts and emails from the Internet.
2. You can redownload your purchased apps. They will be marked "purchased" instead of showing the price. You may not find all of them in My Downloads, but you can always search for your app in the Market and download it for free, if you've purchased it before.
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