Is there away that two different iPhone Apps can share a file? For instance, a directory where both apps have read/write access?
Thanks for any info.

No. The closest thing to this is browser cache sharing (which Facebook uses to remember your Facebook login status across different apps).

Yes and no. You can't do it with a file, but there are some clever workarounds I've heard of though.

I think you can use the keychain to store small information that you can get at from multiple apps. You can also put some data into the pasteboard and then invoke another application by it's URL handler. Lastly you can put the data into an image in the user's photo list and read it back out in another app. You can layer this information on top of a real image too by only putting a few bits of data into each pixel.

Unfortunately, I really need proper file sharing
Thanks for the answers anyway