There are a lot of so-so iPhone apps out there, fun to use once or twice but not killer applications that you simply must have. DataCase is a candidate for that latter classification. (Available via the app store for iPhone and iPod Touch, $6.99)

The DataCase app allows you to copy files from your PC or Mac to the iPhone via the wireless network using a drag-and-drop method. Once on the iPhone you can view and use the files in mobile mode. There's support for MS Office formats, PDF, text, common images, HTML, plus any audio and video the iPhone OS would normally support.

It's pretty slick. I'm playing with it now and can see the real benefits of having a variety of key files, documents, etc. available on the mobile device any time I need them. One problem common to all iPhone apps is the fact that it has to be running in the foreground in order to access the app remotely - no background execution. Good thing I bought this 16GB iPhone eh?

Links: Veiosoft web site and a review at TUAW.