This is not a good answer. The decision to remove "Save As..." is arbitrary, and unintuitive. Why should I have to visit a forum to figure out how to use tools all over again? Safari 5.1 has a "Save As..." menu. BBEdit 10 retains "Save As...". There may be some conceptually elegant reason for eliminating "Save As...", but it doesn't make my work any easier.
Totally agree with Kaitain. This is new behavior and it is not intuitive.