rotation buttons in bottom left hand corner or by pressing < and > If you have the wheel on your mouse, click it, hold it and go left and right
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Hold left click and spin it in the direction you want the object.
Go to Buy Mode and grab the furniture you want to rotate then press the keys to rotate it.
click tools, grab mode, click on an item, press z
You have to press the < and > buttons to rotate in Create A World. Hope this helps :)
To rotate items in the Sims 3 (Nintendo DS), you just press the L or the R button with the item highlighted. I don't play the Sims 3 on other consoles, though, so this is all I know.