Jeff over at jailbreakmovies on YouTube just added a tutorial for chpwn's latest tweak for the iPhone. This tweak brings N9, iPad like gestures to the iPhone in elegant fashion
Step 1: Jailbreak your iPhone or iPod touch with redsn0w 0.9.10b2. Check out this video tutorial if necessary.
Step 2: Open Cydia and install Zephyr through the BigBoss repo.
Step 3: Restart your springboard, then start enjoying your multitasking gestures. Adjustments to Zephyr is available in the extensions in your Settings app.
Be sure to check out the other best Cydia tweaks for your iPad.