I haven't had time to test this one myself but I have downloaded it and on my next sync it'll get added to my iphone. In any case, the app is called Air Sharing and it was written by a company called Avatron Software Inc. Normally the developers say that the app would be priced at $6.99 however they are giving it away for the introductory price of FREE. This amazing deal can be found in the iTunes store for the next two week...Last time I checked there were 69 reviews and I'm sure many more are coming...looks promising so far!
Here's the link and a screenshot of what the app looks like:
http://phobos.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=289943355&mt=8
