Philosopher's Stone was changed to Sorcerer's Stone for you Amerikanskiis.
I thought it was the other way round? That the americans had it changed from Sorcerer to philosopher becuase they were freaking out about the witchcraft thing. ZOMG, we can't say sorcerer, it might corrupt the kiddies! : p

The title for the last book is just... meh. Not exactly thrilling. But, hopefully the book itself will be a good conclusion to the series. ^^ Just so long as Rowling doesn't do a cliche ending I'll be happy. No riding off into the sunset, you hear?