Matt Muller (AussieinSeattle) wrote a nifty plug-in for Seattlites looking to check up on current traffic conditions. Features include:
1. SR-520 Cams (4 of them)
2. I-90 Cams (4 of them)
3. Bridge Traffic Flow
4. Carillon Point Cam 1 (good for checking wakeboarding conditions 
)
5. Carillon Point Cam 2
6. North Taffic Flow
7. South Taffic Flow
More details on this thread at The Green Button.