[Manardariel]

Not only with the lembas, but also with the phial, I might add. An another gift is important: Aragorn is given the Elessar, the later symblol of his kingship.

But for every member of the Fellowship, Lórien is an important expieriance.
Gimli learns to see more behind a person then their race, he also learns that it doesn´t mean anything if your races are actually enimies- you can still be friends. I think it was Galadriel who made the friendship with Legolas possible.
Sam and Frodo, a part from their gifts, found courage in Lórien. After Galadriels´s mirror, they both knew they had to go, or all that they were fighting for- The Shire- would b destroyed.
And Boromir. I think he profited the most out of Lórien. This may sound wierd, but it´s true. In Lórien, he noticed it was the ring he desired. Had he not, he might have followed Frodo into Mordor, causing an even worse dammage when he finally realized his wish.

I think you can´t -and shouldn´t- say that Galadriel destroyed the Fellowship. I think she put them on their paths again:
Aragorn, being king through giving him the Elfstone- I think this was a nice way of saying "Don´t go to Mordor with Frodo, we need you in the war"
Gimli&Legolas, she gave them the idea of being friends.
Sam&Frodo, reminding them of their quest, which lies in Mordor, not Minas Tirith.