For those that are worried, the source is there to inspect and compile. For those that aren't, there's reduced friction. It's a young project and I could move the binary elsewhere, but I'm not sure that would change your concern?
I believe GP was saying two separate things. First of all, it's unusual to commit binaries to source control, because they can't be merged, etc. Second of all, he personally isn't comfortable with binaries and would rather compile from source.
Slingshot's supported Retina since V2. Dropbox's auto-upload of screen shots is pretty good (they're using a private API to copy the link the your clipboard before the upload even starts, so it feels really fast), but if you share files outside of screen shots, Slingshot might still fill a need with file and clipboard sharing.
Amazon offers 2 price points, emphasizes the ad-driven one, and somewhat obscures the fact that it's ad-driven. I don't see how that relates to the free (and Creative Commons free content of) marco.org, and the fact that he syndicates ads from a network he trusts there.
But still, where is "6 months" coming from? A vague "year" figure is given by Mark Post (with the caveat that funding is needed), but that doesn't even bring into consideration the process of getting the meat out of the lab and into the grocery store.
I wondered the same thing about the 6 month figure. This is some aggregator site run by the SciFi/SyFy channel? It's the kind of pop science reporting I think is bordering on irresponsible, really. Their source is New Scientist requiring a signup:
I would have loved to have had this a year ago, or two, etc., but my accidental quits haven't been nearly as frustrating since upgrading to Lion. I can still see this being useful, though, especially with apps that are slow to implement resume functionality.
Having a standalone GCC installer is a nice option (especially if you have an Air with limited disk space), but if you want to avoid the hassle of debugging the occasional compilation failure, Xcode is the way to go.