Already heavily in Internet rumors emerged about the existence of the iPhone OS version 4. In some of them say that the mobile device will have a front camera for video calling. Other rumors do say will be increased capacity on the phone.
There is still no accurate data for hardware changes, but it appears evidence of testing of the new OS.
Last week we saw the first evidence that iPhone 4.0 was in testing with reports that it was already being spotted in web site logs. We pointed out at the time that while interesting, such user agent logs could easily be faked. This week, we've received slightly more evidence that iPhone OS 4.0 is indeed undergoing testing.
One iPhone developer has since noted a single instance of iPhone OS 4.0 being used in their Pinch Media analytics.

step 1: Launch iTunes by selecting its icon in the dock
Step 2: Connect your iPod to the computer. Once it shows up in iTunes press the Restore button under the Summary Tab.
Step 3: A popup will appear warning you that all the songs on your iPod will be erased. Click the Restore button.
Step 4: An iPod Software Update window will open. Click the Next button.
Step 5: Click the Agree button to accept the license agreement.
Step 6: iTunes will now go and download the latest firmware for your iPod.
Step 7: Once installation begins it will ask you for an Administrator's username and password. Enter this information then click the OK button.
Step 8: iTunes will then format and update your iPod after which it will reboot.
Step 9: Once complete you will be asked to name your iPod. Do this then press the Done button.
Step 10: iTunes will now automatically begin syncing your library to the iPod!

method one
How to sync multiple iPods on one Mac?
Create a separate iTunes library for each iPod.
Methods two:
Backup iPod file to Mac
Transfer file on Mac to iPod
Copy iPod file to iTunes
Share music between iPods/iPhone

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ml_iPod is a Winamp plugin that enables music to be loaded onto and off of an Apple iPod without using iTunes via Winamp's Media Library. One of the main attractions of the plugin is being able to transfer files from the iPod to your computer which is not possible with Apple's iTunes software. Winamp's newest iPod plug-in can indeed copy files from iPhone in Windows without jailbreaking. It also supports Creative Zen and PlaysForSure certified devices.
Download and install Winamp if you haven't yet. And then use it to get songs, pictures and videos from iPod, iPhone to Windows PC.

Step 1: Download Wondershare BlackBerry Converter Suite, and run Wondershare DVD to BlackBerry Converter.
Step 2: Import the DVD Files to the software
Step 3: Edit the Video (Optional)

Step 1, Networking computers.
System Configuration，Setting up the PC to share files

Step2, Go to preferences, under the sharing tab, enable "Share library..." and "Look for shared libraries..." on both computers.
Select the items you want to share. It will show up in iTunes' side panel，You will need to authorize both computers to play purchased content however. You may authorize up to 5 Machines per iTunes Music Store account.