Ohmega’s two lots, across the street from one another on San Pablo Avenue, are so stuffed with so many different things as to almost warrant guided tours for first-timers. But half the fun of shopping at this 31-year-old architectural salvage yard involves aimless exploration of home accessories and a century’s worth of design. It may be a lot easier to identify what Ohmega Salvage doesn’t carry than to catalogue its inventory at any given time, but a decent rule of thumb is that any object that could conceivably be salvaged from construction or destruction of a home can be found in at least ten different varieties. When you’re talking doors, windows, and light fixtures, which seem to be the store’s bread and butter, that number ventures closer to the hundreds. Most of the stock is sourced from the Bay Area, but Ohmega also imports items from around the world. The Web site features a fairly complete inventory of its fancier offerings, so if you are in a rush and need something specific, that may be the place to start. But if you’re feeling adventurous, come on down.