Power steering whines and gets louder when you reach full lock, and when you get to the end of the lock, sometimes it wants to return to the neutral position more (i.e. there is a little more resistance). If the grinding is worying you try and compare it to another punto, if a freind/colleague has a similar model or even ask the dealer (who cares if they think you're being silly, better than not having peace of mind) If you then think there is really something wrong, book it into a dealer/garage to have it looked at... Just a thought it could be that the belt has not been tentioned correctly.
As for the other electrical issues, this could be caused by a number if things. The majority sound like there is a loose earth connection on the car, if you know something about electronics, then you can search the forum, and you'll find articles about finding bad earthing, but personally I'd call an auto electrician (although I don't know how to spot a good one
)
As for the heater blowing fuses, this could be because of things (leaves/debris) being stuck in the intake fan, from time to time things manage to get themselves lodged in the most inconvenient places, anyway if there is something hindering the fan it will require a larger current to start the motor, and this is what could be blowing your fuses.
Finally, your alternator may be stopping working, and could have something to do with the above... again search the technical sections, there are probably some good articles on alternators, if you can't find anything on any of the above you try a different section, some problems have a habit of cropping up throught the model range and marks.
Hope that helps.