Yeah definitely acm/IEEE. They also have all their publications online now and do reverse DNS to authenticate so it's all pretty easy. If I don't really have an idea of what I'm searching for then I use google. If I have a good idea but it's very specialized then I'll just walk over to the department and ask some grad student or professor where to go. If I know exactly what I'm looking for then I'll go over to the engineering library and ask someone for help.