Saw an A-10 take off from Boeing Field about twenty minutes ago. Didn't have my scanner with me though.
Also, saw two National Guard Bell helicopters parked at the souith end of permiter road (plus a smaller chopper without blades), where the King County Sherriff keeps there yellos helos. Additionally, at Executive Airlines I saw what a appears to be an ex-military 2-seater trainer (still in its gray color scheme)being serviced (couldn't tell what kind of plane, because of the wall in the way).
The drive along Perimeter Road (east side of Boeing Field) is prety cool, and worth doing.