Okay deep breath... time to be nerdy... seriously there will be no change in gravity, the only difference will be the length of days and seasons. Take a look at other planets, the only reason why they have different gravity is because of their mass not orbit. Also if you look at things closer to the sun they have a shorter orbit around the sun, thus making their days and seasons different from our planet. Also it wouldn't affect anything on our planet physically. Basically if you're flying in a plane, the sexy stewardess is serving you coffee at 500mph. If the speed of the plane increases there is no change unless you account for the momentum pickup.
Also, if gravity doubled... you'd just be twice as fat :P
Pheww....
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