Do you think any country has it by choice?
hehe. I guess we were lucky to have formed up so late (1901). we took the good bits and left the fat behind, even though it was impossible for the UK to get rid of it themselves.
Basically, we have the house of representatives, and the senate. In each, there's a certian number of seats, each seat attached to a geographical area with approximatly the same population, i think. at least, the theory is that the constituancy of each seat is about the same. Local candidate will run etc. (sometimes not all parties will run a candidate, depending on how the area votes previously). As i said before, the leader of each party is decided by the parties members. This can sometimes lead to interesting situations where the leader (or just another important party member) of the party that gets the majority of seats doesn't actually win his own seat, which actually happened to our ex PM last election, though his party also lost.
In the house of representatives, which the leader of the parties all run in, the ruling party (or coaliton if needs be) will have its leader become the Prime minister, and will select people who have been elected to be ministers for different areas (eg minister for health, or minister for workplace relations, treasury etc.), and the opposition party will select "shadow" ministers, who basically specialise in critizing that area of the government. In essence, the house or representatives proposes the bills, the senate must pass them.
So yes, its vastly different from the US system anyway, so me propsing ideas that work well for us aren't going to be of any use i guess, since your president doesn't actually have to hold a local seat, and that, (i think?) your members of the house of representatives and senate are assigned arbitarily from each state?
also "amerka sux dude"