Not really sure what you are trying to ask? Yes there are objects larger than Pluto but at the time of writing I think only 2 Xena another dwarf planet and Eris, which is actually a spread object NOT a dwarf planet, which is the official category for Pluto.
Yes, it's not just the size of the object- it's the behavior as well. I've heard that the definition of "planet" (which excluded Pluto once it was established) is being re-considered. New Horizons - launched by NASA - will arrive to study Pluto in 2015. Lots of people think by then, it will be considered a planet once more.
Pluto is a planet whether or not so considered lately... and in any case they could reverse their desision some time inthe future, clasifying pluto a planet again. Anyway, how the astronomical union clasifies planets,realy means nothing in cosmic terms.
Probably doesn't matter much. We just happened to be able to see Pluto with limited technology, now we can see much further and clearer and have come to realize Pluto was part of something else. It would be nice to reinstate it as a planet, for old times sake.