I live inland and use webcams to guide my decision about when to take a surf trip. Forecasts are very helpful but don't show the interaction of elements (swell direction, period, tide, wind, current) like a live video feed. Here's an example for Steamer Lane today...
Since Bolinas doesn't have a feed, I look at nearby surfcams to get an idea of what the conditions are like. They're also great to see how surfers adapt as they paddle out, wait, takeoff and ride.
How important are webcams in your assessment of a break?