myImage.getProperty("mainImage").Value = Request.Files[0];
Adds helper class "UmbracoFile" for easier file upload / file manipulation in general (to be provider based so we can support manipulation via ImageGen or ImageResizing.NET as well as support for abstracting file storage via providers (through an IFile but currently in an implementation that needs refactoring (used in a wrong way atm)). Will fix that part tomorrow!