What services do you ask for when you take your car for maintenance?

For example, do you just get your oil changed and refill air in tires or do you also ask for other tweaks such as tire alignment etc. And how often (ex: annually, semi annually) do you get these services done? It probably depends on the age of the car so please mention that. I ask because I bought my first car last year (june, ‘07) and I am primarily car illiterate. I want to make sure I am getting all the important services done but also am not paying for unnecessary additional services.

So far, all i get done is the oil changed, air pressure in tire thing.