I've run into that same problem as well. There's been times I've wanted to upload a photo to macrumors or facebook from my iPad but it's as if the site doesn't recognize the ipad as a computer and therefore won't allow you to browse and upload images. Strange. I wonder if that's something that could be addressed with an iPad software update?
Closed file system Huh. I'm new to Apple products, and the mighty Jobs, but i'm finding difficult to gasp this whole concept of being told by Apple how I can use a $700 product I had to purchase.