When I was at the Apple Store today talking to potential switchers I was surprised by the reasons why they were considering the mini. They claimed that they had no dissatisfaction with the Windows OS, but they just wanted something "that would work". Several said they were tired of viruses and things crashing. But yet they attributed that to the PCs they owned.
Sadly, as I mentioned in the other thread, not a single one of them bought a mini today after they realized that the store did not offer any upgrades. In the end, it was the inability of the Apple Store to offer increased RAM that prevented the sales (though one person left when they realized they couldn't get the Super Drive).
I didn't think RAM would be an issue with the mini -- but I now believe it was a major mistake. If the mini came with 512 as standard, the machine would be a great "off-the-shelf" purchase for a lot of PC users. For me, having the Airport Card and Bluetooth is important. But for many low-end PC users they are not a big deal. But by selling the mini with 256, they will experience a Mac that is not that much better performing than their PC. That is a shame -- and a huge opportunity missed.