C-Mezak,
We are NOT exaggerating. When we mention Neds, they are only a very small part of the population, but some of them (typically because they are unemployed) wander around looking for trouble during the day time, particularly in the main shopping areas. Remember that the police know who they are, and are always on the look out. I have lived in lots of places over the last 8 years (California, New York, Sydney, Munich, etc.) and in returning home I do see there are now more people to be wary of in the streets. Some foreigners think Scotland is just a cute little place. It is

, but we do have our idiots too! I mentioned Neds on this thread, not to get off the main topic of apple products, not to be your parents, but just to make sure you have a great time in Scotland without getting any cool apple products taken off you!
Regarding spelling issues for University essays, I'm currently finishing off an MSc Finance, and 85% of the class is foreign, so lecturers are used to different spelling approaches. Just check with lecturers, but they normally do not mind "Americanised" spelling. Also, change the setting in Microsoft Word to UK spelling, and Word picks up the difference in UK & American English.
Finally, seems obvious to say, but bring ALL your software CD's. Some of the international students in my class have been stumped because they only brought their laptops and no CD's. Some of the laptops crashed, others stolen (lets not go there again!) and on other occasions MS Word requested for the original CD to be installed again so that certain add-ons could be installed.
Finally #2, not sure about Edinburgh, but other Universities (I'm at Strathclyde University) do provide full wireless networks, so may be an idea to have a wireless card installed and tested before you come across. A number of students bring their laptops into the library and use the wireless networking facilities because it is warmer there than in their accomodation!
Good luck!