To find out if someone has an OCF account, you can use the OCF User Database.
Faculty and staff are also listed in the whois server on whois.Berkeley.EDU and a copy of the UCB Faculty and Staff Phonebook is available if you gopher or telnet to infocal.Berkeley.EDU. [9/20/99 note: these two links don't work]
The campus division of Information Services & Technology provides e-mail accounts to students, staff, and faculty on uclink.Berkeley.EDU, uclink2.Berkeley.EDU and uclink3.berkeley.edu. You can search for UCLink users by "finger"ing at any of the three -- they have seperate user sets, but finger at any of the three looks for people in all three. [9/20/99 note: uclink and uclink2 merely foward to uclink4 now. everyone is a uclink4 user for all practical purposes]
There are an incredibly large number of computers belonging to various departments and used for classes. Among the largest of these are web.Berkeley.EDU, which is used for Computer Science and Math classes. Some departments also give accounts to majors on their machines, such as physics.Berkeley.EDU for Physics majors and cory.EECS.Berkeley.EDU for Electrical Engineering & Computer Science majors.
Other student organizations that give accounts to members include: