Uni has really made me question my identity in terms of friends and friendship groups. Now I hated the whole clique atmosphere in high school, so I'm glad that uni is really laissez faire, and opens me up to a whole heap of other people. I've found oddly satisfying friends in people I never thought had it in them, e.g. friend from HSC tutoring doing Engo/Commerce has introduced me to two of her friends, and they're lovely girls too, and there's a whole bunch of international students in pharmacy whom I hang around, and if you get past the language barrier, it's really quite ok.
As for the question--I only have three real friends left from school, one of whom is in Year 12 atm, and the other two have moved on with their uni courses, but we still phone occassionally, something like 3 times so far this year. I'm mainly shifting around now--find someone interesting, and get to know them better, and this way I've managed to get half a table together for my workshop (the other half being through my friend's friend and his friends), and lots of alternatives to sit with if seating arrangements don't turn out well, or we get separated from one lecture to the next.