A simple trick great for street photography: Rear Sync flash (some compacts have this)
-Set your flash sync settings to rear
-use a slow shittershitter shutter speed (1/20, 1/30 should be fine)
(photo by alexanderbot)
Works really well the places with lots ot light and movement
More info here
Update: had to correct my typo, but shitter speed is way too funny to delete it :D