Alright... back to srgue discuss the issue!
First off, you're completely ignoring software in your base claim. Most notably, the Internet - and all the neat innovations that have come with it. Wikipedia, Google Earth, browser searching, file sharing... and on and on.
Aside from that, I generally agree that there have been very few revolutionary inventions in the last, oh, 25 years or so. However, there are some caveats there. You have to determine what you mean by a, as you termed it, "breakthrough". If you replace the old-style Walkmans with an iPod Touch, have you made a breakthrough? Most people would say no, BUT if you had made that change over the space of three months instead of three decades, what would you say then? Constant innovation can, in the long run, serve the same purpose as sudden invention.
I also have to object to your arbitrary time for the "rise of corporations". Take a look at the Gilded Age, and tell me that corporations weren't more influential then than now.
I'm excited about ME2. Sad, that Bioware seems to have dropped the ball on DA - but I'm not too concerned for the next Mass Effect, since it's substantially the same team of people as ME1.
Software is just something that runs on hardware, it's dependent on hardware. Internet, or better said, interconnection/networking is important, but as we all know, internet came from arpanet which transfered it's first message somewhere around 1969. It's been mostly evolution since then. As more computers connected and speeds rose it had ability to do more. While internet did have major impact on our lives, then again, I said "most technological advances"

. But we all know
why the internet was invented 
.
To me breakthrough is something new, something that will change our lives and give us ability to do something we couldn't do before, or to water it down a little, to do something we could do before, but radically better. An example for the latter would be, let's say, solar panels that would have high enough efficiency and would be cheap enough to replace our current power plants (to stay somewhere within our current limits and not to call on vacuum (zero-point as some call it) energy

).
To me, our greatest hurdles at this moment are power source and propulsion. Power concerns really wouldn't appreciate if someone would discover something cheaper and more efficient source that would take them out of business (some conspiracy theorist (OK, loonies) even think that "they" hid some Nikola Tesla's works that would do exactly that). And in a way, propulsion is linked with power source, you can't really make something new that runs on gasoline

. Plus, if we switched to something other than fossil fuels what would all those poor petrol conglomerates do? How would they make artificial islands then?
Yes, I know, I watch to many sci-fi (well, more like read) but chemical propulsion is not that practical for space flight. It's also not really nature friendly either, since basically that's what we also use on ground. And not necessarily for colonization of our galaxy and/or giving anal probes to unsuspecting martians but to even build stations in orbit or on the moon. Cost of current way is to the moon

.
I'm not exactly sure what you mean with "Gilded Age", at first I thought you meant age of guilds, but google says it's late 19th century in the US. I'm not that familiar with US history (being from ye olden continent) but from what figured while skimming through the article there were technological advances during that time. But there's one pretty big difference with now and then. And that's globalization. They could perhaps influence US, but not exactly the whole world as they do now. I said "perhaps" because my impression was that companies of that time actually competed who could do better, and that's where the difference is. Today if you come up with something new they'll just buy you and swallow you up.
On topic of games, you know, it's kinda related to corporations and money

. You have PCs and consoles. Before there were games for consoles and games for PCs. So why not put them together and make the same game for both

. Problem is, PCs and consoles don't have the same audience and there's pretty big chance that said game wouldn't be well accepted by one or the others. And if it fails on PC blame it on piracy

.