Invisibilility Cloaks and the hallows

[Natalie]

No: HPFGUIDX 172676

Hi! I was a lurker and this is my first post.  I tried to catch up on 
the posts to see if this has been discussed but it's impossible to read 
all of them so here are my 2 burning questions...

1. What is the significance of the deathly hallows really?  Yes they 
are powerful and help Harry do things, but I just don't see them play a 
big part in Voldemort's defeat.  The thing that brought about V's 
downfall was Harry being the last horcrux and his sacrifice.

2. Aren't the hallows supposed to be one of a kind?  Yet Moody had 2 
invisibility cloaks too which he borrowed to Order members to stand 
guard at the Dept. of Mysteries....

any theories?

Cheers/Natalie