While the sadly common "CF Net dance of evasion" continues, I put forward this further actual argument. Note how I make an actual case, and abstain from vain and ungenerous speculations about the motivations of other posters:
Paul is not denying “salvation by good works” in Ephesians 2, he is denying “salvation by doing the works of the Law of Moses” (the Torah). However, this view appears vulnerable to the following critique: Since Torah contains moral prescriptions (such as the 10 commandments), any statement that doing the works of Torah does not save really amounts to a statement that good works do not save. As will be demonstrated, this objection turns out to have no force.
As per an argument provided earlier in this thread, the “works” of verse 9 (that do not save) are the works of Torah. As that argument shows, Paul is focusing on the role of the Torah as an ethnic delimiter, not as a code of good moral conduct. That is why Paul weaves circumcision into the argument. In verse 11, he contrasts the status of the Gentile by birth (not by good works) to that of the Jew's status as being circumcised. This is not a good works issue - Paul describes a dividing line that is ethnic, and circumcision is the hallmark "work of Torah" - it is not a "good work".
In verse 12, Paul describes the Gentile as not being a citizen of Israel and being an outsider of to the covenants. Again, this is not relevant to any argument about good works. It is a claim about the Jew's status as a member of an ethnic group. And it is the Torah that is the charter of the Jews as a people - it is the Torah that marks them out as distinct from the Gentile. So, once again, this is not the kind of argument one should be mounting if a denial of salvation by good works is on the table. And it is precisely the argument that denial salvation by works of Torah is Paul’s intent.
Let's be clear here - while the Torah indeed has a "moral" or "good works" dimension, Paul is focusing on its function of splitting the world into two camps - Jews and Gentiles. And the Torah does this through things like Sabbath, circumcision, and kosher purity laws.
We already know that Paul sees Jew and Gentile as both morally bankrupt (Romans 3). The rhetoric of the argument (in Ephesian 2:11 and following) is clear: Paul is saying that the abolition of the Law of Moses has brought Jew and Gentile into one family. Therefore, Paul is clearly seeing the Law of Moses as an ethnic delimiter. If you are going to make the point that Jew and Gentile are in the same family, the perfect way to do this is to undermine the function of Torah as an ethnic delimiter. Thus the perfect thing to say that "the works of the Law of Moses do not justify"