Garry Wiseman project leader of Window Live Expo, a free classified service provided by Microsoft, blogged that Sino.com has unauthorisedly copied parts of its old lay-out. However, recently Wiseman has withdrawn the posting, see here why.
According to Big Mouth Media Wiseman wrote that:
"The post above was mainly intended to raise the issue of cross-border copyright infringements and signal that it's not acceptable." He was not expecting sympathy.
Are the sites similar enough that one can speak of copyright infringement? Tech Crunch does not think so and has a good post about the affaire including two screen snapshots, so you could arrive at your own objective judgement, here.