The Safe Escape smoke hood is probably the best combination of price and performance out there now. I like the fact that it has an actual flame/heat-resistant hood that you can pull over your head to keep your hair from catching fire or burning your face. There are a number of other smoke hoods that look good, too, but are more expensive.

Another product that someone brought to my/our attention not that long ago is the Xcaper mask. There are a lot of masks with basically the same form factor, but the Xcaper seems to be the real deal because it actually filters carbon monoxide, unlike all the other similar masks that filter soot and some fumes but not CO. It's small, so good for tucking into your purse/briefcase for commuting. It's a tradeoff between size and having a hood and a replaceable filter canister.