The beset way to store application data?

I am wondering where is the best place to store the data that is accessed by my cocoa based application?
for example, my program needs to save passwords, and email accounts in some file and then retrive these info from this program later.
I am looking at "local domain" - application/utility
is that right?
also, I am using NSFileHandle to do the file I/O, is that the right way to achieve such tasks?
how can I obtain the path of "local domain"? thank you.
Power G5 Quad Mac OS X (10.4.3)

save small amounts of user specific data to
~/Library/Preferences/com.mycompany.settings
and system wide data to
/Library/Preferences/com.mycompany.settings
you also might want to look at the
NSDictionary -writeToFile:atomically: method.

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The beset way to store application data?

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