And while we're on the subject, many folks have been wondering a bit over the title. Ever helpful, Wikipedia has this to say on the subject:
The meaning of "Hallows"When asked "What does 'Deathly Hallows' mean?" J.K. Rowling responded, "Any clarification of the meaning of 'Hallows' would give away too much of the story - well, it would, wouldn't it? Being the title and all. So I'm afraid I'm not answering." She also declined to say what her two other shortlisted titles had been, at least until after publication.
Hallow is a word usually used as a verb, meaning "to make holy or sacred, to sanctify or consecrate, to venerate". However, in Harry Potter and the Deathly Hallows, the word hallows appears as a noun. In modern English, the word is used as a noun in "All Hallows' Day" or "All Saints' Day," which is the day after Halloween or "All Hallows' Eve". Hallows can refer to saints, the relics of saints, the relics of gods, or shrines in which the relics are kept. Since the essence of these saints or gods were often considered present at their shrines and in their relics, hallows came to refer to the saints or gods themselves, rather than just their relics or shrines. So, the hallow (relic) of a hallow (saint) is hidden in a hallow (shrine).
Clears it all up, right? Only JK herself knows for sure... until July, anyway.