One of the hot topics in syntax dissertations in recent years has been ellipsis (I’m not kidding–when I was on a job search committee a few years ago, ellipsis was *everywhere*).
Bos and Spenader (2011) have an annotated corpus!
- Bos, Johan and Jennifer Spenader. 2011. An annotated corpus for the analysis of VP ellipsis. Language Resources and Evaluation 45(4): 463–494.