Over at Macworld, Andy Ihnatko ponders whether Lion’s sandboxing feature might mean that one of Apple’s best babies — interapplication communication — is being thrown out with the bathwater. Notice also the link to a Jason Snell article in a parallel vein. This is something that some of us here at TidBITS have been quietly worrying about for months. follow link
Using Expose within Spaces
To drag a file into an application that's running in another one of your Spaces, use Expose while in Spaces overview mode. First, press F8 to go into Spaces overview mode, then press F9 to Expose all application windows. Hover over the application window you want and wait a moment or press the Space bar, and both that space and that application come to the foreground, ready for you to drop the file.
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Macworld Muses About Lion’s Sandboxed Future