Hi, Paul Narracott became the first Australian to compete at both the Summer and Winter Olympics: he had competed in the 1984 Summer Olympics in athletics, and participated in bobsleigh in 1992. Hope it helps!
Yes, you can compete in consecutive Olympic games.
The sports that Australia did not compete in at the 2008 Summer Olympics were handball and baseball.
The only sport the US does not compete in at any Summer Olympics (including 2008 and the upcoming 2012) is handball.
There are winter Olympics so people with winter sports interest can compete in the games. eg. Skiing, figure skating. Summer Olympics so people with summer sports can compete in the games. Gymnastics, swimming...ect.
Women first competed at the 1900 Summer Olympics in Paris.
1996 Summer Olympics in Atlanta.
Italy first competed in the 1896 Summer Olympics in Athens, Greece.