The MPQA 2.0 corpus  has some labeled opinion expressions, but they are generic subjective expressions as opposed to aspect-sentiment phrases (see Section 1) we find in reviews.
the thread of research in (Brody and Elhadad, 2010;titov and McDonald, 2008;Zhao et al., 2010;Mei et al., 2007;Jo and Oh, 2011) focus on extracting and grouping aspect and opinion words via generative models but lack the natural aspect opinion correspondence (e.g., in the manner they appear in sentences).