My car is a hatchback but it's a Pruis, so the rear window is pretty angled. As a result I don't like to have a bike rack on the back -- I just don't like the way it sits. I do find that I can get two bikes inside my car. I take the front wheels off, put one bike in, cover it with an old blanket, then put the other bike on top. For just one bike, I could leave the front wheel on, but find it easier to take it off. Either way, I put the bike in fork-first. One of my friends has a BMW station wagon, and he finds it easier to get his bike in and out of the car by putting it in rear-wheel first. He leaves both wheels on.

Anyway, that might help until you get a rack, or for days when you prefer not to use one.