If you’re interested in what a future version of Photoshop may offer, you must check out Adobe Photoshop Sneak Peeks on YouTube: www.youtube.com/photoshop
There is also a competition for Photoshop enthusiasts as follows:
We’re on the hunt for the Next Photoshop Evangelist! Submit a 2 minute video showcasing your “Hidden Gem” in Photoshop CS5. Hidden Gems are lesser-known features or new uses for commonly used tools that people may not already know about. The winner will receive a trip to Photoshop World, the opportunity to showcase their Hidden Gem live at the show, time with the product team, Creative Suite 5.5 Design Standard & more. The deadline for entries is March 5.
There is a blog post explaining the competition at: http://adobe.ly/xRybbK
Plus a Facebook contest tab at: http://on.fb.me/yMckh7
Please note the following: *NO PUR. NEC. Open to 50 U.S. (excl. RI), D.C., Canada (excl. Quebec), the UK and Germany. 18+. Rules: http://bit.ly/ArKueY

Saving your backgorund image and continue working with another image is indeed a must. Thanks for sharing and very good idea. Will register