I really need to upgrade my old 15" MBP and have been really impressed with what I have seen so far with the 13" MBA. After seeing the MBA I cannot imagine buying a new system with an internal HDD and Optical drive. Just does not make sense. On the other hand, I am a pretty serious at multi-tasking and wonder if the MBA will be able to keep up. I've been using higher end MPB class Macs for around 10 years now, and may be taking certain things for granted. First, here is my current system: 15" MBP Early 2008 2.5 GHz C2D 6 MB L2 8600M GT, 320 GB 7200 RPM Now, here are the list of apps I almost always have open at work: - Mail with one browser, 3-4 notes windows open and 4-5 messages open - Adium - MS/Entourage - MS/PowerPoint with 5-10 slide sets open - MS/Excel with 5-10 spreadsheets open - MS/Word with a couple of docs - Preview with 3-5 docs - Camino with 3-5 windows open (Flash blocked) - Firefox with 3-4 windows open (Flash blocked) - Address Book I quit usingFusion, so good so far? Then I go home where I start doing video editing with my 1080 HD AVCHD footage. I don't close any of my work stuff, because I often have late night and early morning calls. At home add the following apps. - iMovie for video editing - Toast for burning Blu-ray discs - Voltaic (AVCHD video encoding) The next part is what makes me nervous. While pulling in AVCHD footage via an SD card reader in my ExpressCard slot and writing to a Firewire 800 disk I am burning a Blu-ray movie from Toast via my FW400 port. At the same time I might be using Carbon Copy Cloner to update my system to a different 2.5" external Firewire 800 drive. Oh yeah. Time Machine comes around once an hour and wants to backup to my Airport Extreme over ethernet. Will I be able to do all of this with a MBA? I am especially interested in knowing if I will have enough I/O bandwidth. I'll be going from a machine with FW800, FW400, 2 USB2 ports, and ethernet to a machine that just has 2 USB2 ports. I did do a little test with USB and it takes 2.5x the time to copy a file compared to FW800. I also verified that iMovie will let me scrub HD video in with data connected via USB2. The only problem was that I did all of this on a MBP. The biggest let down for me from the Air announcements was the absence of a FW800 port. Has anybody out there tried to push this much I/O through a MBA?