In an unusual development in the world of securities litigation, Telecomweb reports that the class action pending against AT&T in the D. of N.J. has gone to trial. Proceedings got under way yesterday in the case, in which the plaintiffs allege that AT&T engaged in fraud in connection with its initial public offering of AT&T Wireless in 2000. The court granted partial summary judgment to AT&T this past June, but allowed some claims to proceed.