I dunno. The only products which have really made my jaw drop in the last decade have come directly from Google (Earth, Street View, ...etc)
Everything else has been pretty much evolutionary.
Actually, this comparison to Dropbox is largely irrelevant. Google has long had the stated intent to move everyone into the "cloud" (whatever that is at any given time.) If anything, this is another piece to their plan to unseat Microsoft as the dominant operating system supplier, and you do that by eliminating the very need for Windows and Office. Logically, if you want people to use your Web-based operating system and practice ubiquitous computing, you have to permit them to store their data online as well their applications. "The Network is the Computer." Oh wait ... that was Sun. But where Sun Microsystems failed, Google is succeeding.
This isn't so much competition to Dropbox as it is a logical and necessary step along the path they've been on for some time now. Now, whether you agree with where they're going, and whether it will ultimately be good for society is another issue entirely. But this is not Google being like Microsoft and deliberately stepping on a smaller competitor (although that may be the result), but rather Google being entirely consistent with their long-stated goals. It just took them a while to get here.
Keep in mind that there's already plenty of competition to Dropbox, besides Google Drive you have Box, SkyDrive, Amazon's CloudDrive, and a host of other similar services, both free and paid. Google isn't even giving away the most free storage, either ... I got a 50 Gb. Box account awhile ago. It has certain limitations, but it's free and it's ten times bigger than what Google is offering.
Ultimately, though, the key to Google's approach is not how many gigabytes their giving away, but the integration with their other services. If all you want is free online storage, there are many better options to Google Drive right now, Dropbox being one of them (functionally Dropbox is about the best of them, I'd say.)
This is Google going head-to-head with Microsoft, Facebook and Amazon for as big a piece of the online pie as they can manage to convince us to give to them.