I've seen more hybrids on the road because of the sustained rise in gas prices. Personally, I think the best thing in the long run would be for oil to go high and stay high; we had made real progress in the US in energy reform in 1980; then the oil glut caused the bottom to fall out.

Heating oil suppliers are offering biodiesel (same as #2) for heating oil. Mine doesn't yet; I may switch to one that does. Still costs the same, but it's from renewable sources.

There's a guy in our area who fills his diesel truck with filtered used oil from MacDonalds! This stuff is usually costly to dispose of; this guy gets PAID to put it in his truck. Some racket, huh?