Hi, I will be installing photoshop CS5 on my new macbook air i5. As some of you may be aware, Lion and I believe Leopard run as 64 bit operating systems, but apparently you can switch easily to 32 bits by rebooting the machine and holding down the keys 2 and 3. My question is, have any of you installed Photoshop CS5 on lion yet, and can you please let me know if you can run Photoshop when the operating system is running at 32 bits? And don't worry about needing to do anything to switch back to 64. It does it automatically once you reboot again after being in 32 bit mode. The reason I ask is because I run some special work related programs that only run while the OS is set to 32, so I want to know if it is possible to run Photoshop irrespective of how you are running Lion. Thanks so much for your info.