Honestly, I think the only users who will have trouble with Linux are the ones that are in between 'newbie' and 'power user'.

A computer user who just checks their email, surfs the web, plays little flash games etc. will have no trouble at all. All the software is there, and on most modern distros all that software is literally a one-click install. All they need to do is find alternatives to the programs they are used to (eg. Firefox instead of IE, Thunderbird instead of Outlook, GAIM instead of MSN/AIM/YIM etc).

For power users, they will know more about what they are getting themselves into. They will be willing to learn the new OS and will likely pick it up easily.

But for the users that are in between, I think thats where the learning curve is felt the most. Most modern distros have auto updates, one click installers etc. but for the user who is used to tinkering with settings but not to the extent of a power user, they might find it a bit difficult.

All in all, Linux these days is not half so hard as it used to. It's gotten easier even in the last year thanks to distros like Ubuntu who are specifically targeting the desktop OS market.

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