Let's be careful to distinguish between "cleaning" and "disinfecting". I use vinegar in a spray bottle myself to help cut soap film or hard water deposits around the bathroom fixtures and for that purpose, it seems to work reasonably well, but I'm using it for cleaning. Disinfecting or sanitizing follows cleaning and is not the same thing.

Vinegar may be moderately good as a bactericide, but I don't think it works so well at killing/destroying viruses, which is what we want if H1N1 is going around.

To be sure of doing a good job, I would use a commercial product that is EPA approved as a virucide for influenza. Or a homemade bleach solution like the one Jeff linked to. And make sure to keep the surface wet long enough to let it do its job. However, I will not be hiring Doug as my maid since every carpet will be bleached, every wooden floor rotted through, and every door knob horribly corroded in my house!

Edit: I was Googling some more just now and I do see some mention that vinegar works on viruses, but no specifics. For now, I can only assume that an EPA approved virucide works better than vinegar. Anyway, so it depends on how much protection you need.

Edit #2: I did just read one scientific article comparing commercial disinfectants along with vinegar and baking soda. Vinegar did better than I thought on some bacteria, but it was hit or miss. It didn't work against E coli or S aureas which are some of the heavyweight bacteria that we would want to get rid of. Didn't seem particularly effective against at least the polio virus used in this experiment, but neither were many of the commercial disinfectants. However, the EPA certifies products as a virucide separately from their bacteria-killing ability, so those products may not even claim to kill viruses. Anyway, if I had someone sick with what seemed to be the flu in my house, I would go for the commercial virucide or a bleach solution.