The other morning I poured some plain old distilled vinegar into a spray bottle, added a squirt or two of dishwashing liquid and attacked my weeds. I don't necessarily mind pulling weeds, but 1) you have to stay on top of it or they get out of control quickly and 2) it is nearly impossible to get them out of the cracks in the cement completely.
While I was spraying, my vinegar-smell hating husband poked his head out the back door and asked if I wanted him to use "real weed killer".
Now, why would I want you to do that? So you can be like this city worker I spied the next day at the library:
And his results from spraying "real weed killer":