Video Editing? You can't be serious. Maybe the most basic of standard-def iMovie projects. The mini is a great little machine - but lacking two features that are very important to some folks.
1. Disk I/O. It's got a slow 5400 rpm laptop hard drive. I do video editing on my MBP, and I assure you that even the 7200 rpm 320 GB drive I swapped into it isn't sufficient to handle the I/O load. I've got a FW800 external RAID array just to satisfy the I/O requirements.
2. 3D graphics. Yes, the 9400m is a big step up in this department (compared to the intel IGP) but even 9400m is barely enough to run WoW, much less a more demanding game or 3D app.
Both of these two drawbacks would be easily addressed in a "normal" desktop system. Of course then you lose the ergonomics and design of the mini. It's all a trade off I suppose, and that's exactly my point - that the mini is not the "one desktop to rule them all". Where it fits, it fits well, but it's not the right tool for everyone.
This post is full of assumptions. I couldn't help but reply. Have you tried to use a Mini for video editing? It doesn't sound like it, it sounds more like you are making up facts to support your claim. Why not ask what type of video before ridiculing the poster? Maybe it is standard-def, but get the facts straight before being a dick.
1. Disk I/O. You do realize that many people upgrade their Mini beyond what Apple provides? At the very least, I am sure more people want to do more serious work with their Mini, upgrade it themselves with a faster drive and RAM. When I got both of my Mini's I turned them on to make sure they were working, then popped it open and tossed in a 120GB SSD and 4GB of RAM.
I find it sort of comical that you mentioned having a FW800 RAID array to satisfy your I/O requirements, yet you dismiss the Mini? Do you realize it has the same potential? Hence you could do the same thing with a Mini, and cheaper than a Macbook Pro and get at least equal performance? Did I mention it would be cheaper, you could even get a bigger display!
2. 3D graphics. This has very little to do with video editing. Unless of course you are producing 3D graphics, in which case I am guessing you would have a more powerful machine, more powerful than you MBP I am sure. There is no doubt there are better GPUs in Apple's lineup, yet the 9400M would be fine for video editing, even HD, especially since it supports OpenCL.
You end with more assumptions. The poster you replied to didn't say the Mini is the only desktop you will even need, on the contrary, he or she was pointing out that the Mini is a capable machine and would be fine more many people. You can get of our high horse now, there was really no need to mount it in the first place.