Last week's bullish signal is this week's perfect four as all four sentiment indicators are issuing buy signals. Essentially, the "smart money" is buying while the "dumb money" is bearish.
For a broader look at the significance of a bullish signal from the "Dumb Money" indicator, please check out the following article from March, 2009: "Putting a Bullish Signal Context".
Market-wide sentiment remained cautiously positive last week as the gap between the number of companies with buying and those with selling widened. Buying, however, was once again scattershot and not very telling from a macro perspective."