The information is not directly available.
You can use the baseline and horizontalOffset of a character to get its y and x coordinates on the page (assuming no rotation). You can then use information about pointSize, leading (watch out for autoLeading), ascent and descent to get more information about height (similar but not the same information as you would get by converting to outlines and measuring that).
In CS3 you can get the width by using the endHorizontalOffset of the character. Or you can get the horizontalOffset of the next character (although you have to watch out for line-wraps in that case).
Dave