The MLS players union has published the current salaries throughout the league.
David Beckham, technically of Los Angeles, remains the highest-play player with $6.5 million. The remainder of the league's top five: LA's Landon Donovan, $2.13 million; New York's Juan Pablo Angel, $1.92 million; Toronto's Julian de Guzman, $1.72 million; and Seattle's Freddie Lungberg, $1.31 million.
Here's a link to the full union list.
And here's the Sounders' portion of the list: