My list would be
1) the reversal of fortunes of Honda/Brawn, Toyota, Williams via the diffusors,
2) the fabulous (it appears) design of A.Newey (2 teams), and
3) the more different tire choices which push strategies (lesser tire first, or last or for only a few laps or ...) and lastly
4) weak McLaren, Ferrari and to lesser degree BMW. (opposite of #1 but listed anyway)
I hope that they will always supply non optimum tires for each circuit, and hopefully make tires a large strategic part of the race, Australia - very diff tires and end of race was very interesting, Malaysia not as diff and probably not as big (hard to tell really) a strategic part.
These things are making F1 more interesting IMHO this year!! Let's hope FIA does not screw up #1, #4 will have to respond.
What are your significant bits?