How to cut baseboard trim for inner corners? I have a room that is a rectangle and I'm not sure...

I have a room that is a rectangle and I'm not sure exactly how to cut/miter the corners and at what angle...any warning would be great. Thanks
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I say 10 points for Robert S = mitered inside corners look like crap - but for now then as soon as the weather change. Coping is really not hard to do. Robert S describe the process well. If you don't take in then search the internet for "how to cope base" and you'll find video like this one: http://www.expertvillage.com/video/6604_...
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Use a miter box. If you can afford it rent or buy a electric power compound miter saw. It's easier and more precise.

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The trim will be cut at a 45 degree angle from back to front of the trim for an inside corner and 45 level angle from front to back for an outside corner. The very best road to do this is with a power miter saw it is the fastest and easiest with professional results. If you don't own one, you can rent one for a sensible price. Once you get the hang of how the saw works, you will be proud of your craft and will have done it yourself. Here is a tip, the angle of the miter is 1/2 the total angle of the corner, ie. 90 degree corner-45 scope miter, 45 degree corner-22.5 degree miter. Good Luck
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2 ways I would do it:

1. I estimate the angle of the wall with a protractor, if is 90 (rare) I cut mitters at 45 each(using a mitte saw or mitter box) to form a 90, if its a diffrent angle just divided by two. When nail set your nails at least 1 1/2 inch away from the mutual (corner)

2. I do this when dealing with 5inches baseboard or taller,
I cut one pice straight (no miter or cero angle) then the other one I cut it at 45 or partly the angle of the wall, and using a coping saw I cope the miter to interlock the joint..this is a little more difficult but works better within big moldings,and I make the joint tight next to mdf shims only if necessary basically to have a better joint.

Then for both procedures steep the nailholes with spackle and caulk the gap between the molding and the wall newly if it is less than 1/4 inch, if bigger.mannn...then I will float it whith drywall compuound to own a nice professional finish...
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Answers:    Corner trim is the art of a finish carpenter.
DO NOT just cut two pieces at 45 degrees.
It will unscrew up & look terrible forever.
Note the direction from which the corner is viewed.
Put the first piece of trim on the short wall, butted to corner.
Cut the other wall piece at 45 degree in a mitre box.
Then remove the angular part near a coping saw.
It will now fit perfectly over the other piece & stash the joint.
As the house shifts with moisture & age, the hole won't show.