Do you think that the stories or any other information that appeared in the Demigod Files will have any effect on The Last Olympian ?

I do think they have meaning. I have a feeling Hades might use that sword in battle, and yes, maybe the Bronze Dragon will guard the camp. But mostly I feel that they are important because they mention Nico's plan.

they r just short stories taking place in b/w BOL and TLO

I think the stories are important. The Bronze Dragon I don't think will be important, since that was just a strategy used by Annabeth and Silena in Capture the Flag. The Sword of Hades will probably be important, since it's so powerful. Maybe the birds that guard Ares's temple will be in it, but I doubt it.

Think of The Demigod Files as book 4 1/2, or like Beedle the Bard in the Harry Potter series.

hm maybe the bronze dragon and the sword of hades, but that's it.

I think that nico will go on his quest
to destroy the monster on kronos side
so it will weaken him

if i remember right, in the begining of TLO in the demigod files, percy says something about last summer. i dont remember what it was off the top of my head, but i think they will play a role in the next book.

i think that whatever you think is right.

no i its just facts you might want to know and some other stuff but there is a new one coming out for the heroes of Olympus series its called the demigod diaries you can learn more abought it at wwwltheheroesofolympus.com

obviously everybody knows this if they read the 2nd series but I'm still answering. What happened in "The Sword of Hades" will be mentioned in "The House of Hades" and what happens in "The Bronze Dragon" will be mentioned in "The Lost Hero".

Maybe they will be mentioned in the next books...