If You Think Blurred Lines Sounds Like Marvin Gaye, Watch This Video
Yes, I think that Robin Thicke's song "Blurred Lines" sounds like Marvin Gaye's "Got To Give It Up". So much so that, had I been on that jury, I probably would have gone along with that verdict.
With that being said, there are MANY songs that sound SIMILAR. I think Robin Thicke should have approached the Gaye family for permission to release the song (for a pre-arranged share of royalties).
This video shows how similar many songs are, using the same chords.