At last -- Google Maps is a site that is easy to use. (Well, I didn't try to add a picture of our library to the map.)
I particularly liked the fact that the directions to/from the library include total mileage and driving time, with extra time "in traffic" noted --- so when is there no traffic in San Francisco? I tested directions to our library from the San Francisco Bay Bridge: for directions coming to the library, total distance is 12.3 miles, about 17 minutes, up to 30 minutes in traffic; returning to Bay Bridge from our library, time is 18 minutes, up to 40 minutes in traffic. The one time I tried driving to work, on a Saturday, it took more than an hour to get to the Bay Bridge from the library at 5pm --- that was the last time I didn't take public transit. (It was quite fast at 7am, though, getting to work.)
The directions print out very nicely, in large type with the exits in bold: easy to read while driving. I've been using the California State Automobile Association's map/directions for my personal use; I'll probably switch to Google's site.
23 Things #19