Has the boss gone too far?

Uhh...Not many bosses actually make people work on their own time. Besides presentations that need to be done anyway, a boss usually or never will give you something to do on your personal time (and he can't do it, check your contract if you have that problem).

To 'expect'? No. Unless it's specifically part of their job description that they will, from time to time, have outside work that needs to be done, then the employer has no right to 'expect' an employee to be working on THEIR time. The employer can ask, and if their request is refused, they're out of luck. But expect? Not unless the employer is a power tripping, insensitive jerk.

You are too vague. This is where you explain. No one can give you a good answer.

It depends on how important the extra work is and if its a usual occurance or not. If its unusual and very essential then it could be okay. If its frequent and just extra work that needs to be done then you should be paid. Maybe you could ask for it as a regular assignment with an additional increment as a reward. You should watch this, though, you could be taken advantage of if you are anxious to please your employers.