Yup, so far most of the extra-solar planets found have been gas-giants like Jupiter, but they keep getting better at it and now they're starting to find smaller rocky planets like earth. They even found one thought to be made of diamonds! No kidding!
The latest news release states that we now believe that EVERY star has planets in orbit around it. Finding Earth sized plants is difficult because such planets are tiny against their sun's binding light. But it is believed that within fifty years, there is a 100% chance of identifying an earth-like planet with water and oxygen in it's atmosphere.