I needed to get some files onto my iPhone 3G S so I could travel with them and read them. Not so much edit them, although some programs do the same. My main issue was this, could I put files on my iPhone for later reading fairly easily? And for access without needing to be on WiFi to access the data. The answer is yes, but it depends on the application you're working with. I tried several, and here is my quick review of them [all are available at the iTunes Apps store, some for free]:
Air Sharing: A great program which allows you to move files through the Finder's Connect to Server method or using Bonjour. Once you have the iPhone on your desktop, just the same as any other disk, you can click and drag files and folders to it. I had better luck with Bonjour, but they're all there and readable. Nothing fancy but very straightforward.
I used Evernote and SugarSync and put documents in them, but they require WiFi to access the documents in their respective clouds in the sky. Good programs and lots of features to justify using them. Both of them [and Dropbox] allow people to have 1-2 G of space free to access, which is a great way to share files and materials. But WiFi is needed to access the data, which is not what I wanted.
I had data in Tripit.com and TravelTrackPro and both showed up fine on my iPhone, without wifi. Not all the files I wanted, but the trip details came through just fine.
Discover, DataCase and FileAid all seem good, but I had trouble accessing them to place files on the iPhone. My understanding is that Discover does need WiFi but Datacase and FileAid do not, once the documents are on the iPhone. SavySoda's Document requires WiFi as does Documents2.
I tried FilesLite which is a free version of Files. Both take in and display the data [Files will allow some other features but the free version is just fine - other than my data is now in the free version and I'm not able [as far as I know] to easily move it from Lite to Files. Plus the uploading of the documents is only one file at a time [whereas Air Sharing just lets you click and drag to it].
There's also ZumoDrive, which operates somewhat like Evernote, SugarSync and Dropbox, but I had some problems placing some files on it and had found other options, so didn't go further. It seems to operate like an iDisk, as it mounts on the desktop as a Device.
Right now my vote is for (1) Air Sharing and (2) Files. Both at the iTunes App. Store.
Amendment: I stand corrected = I just used Cyberduck and WebDAV access [you can
also use Bonjour] and did a simple click and drag to the phone....all
is well!!!