From the pictures it looks like all the good consoles are in there, Playstations, Dreamcast, the Nintendos, Atari, plus handhelds. Then it seems there are a bunch of special edition consoles.
As for games, I keep on seeing great games in there, including recent ones and old classics. Many are obviously imported and that's fairly expensive with the current Yen/Dollar exchange rate. Here's a picture of what appears to my eyes to be nearly every Zelda game: http://imageshack.us/photo/my-images/713/517ie.jpg/ Every Mario game: http://imageshack.us/photo/my-images/441/513ku.jpg/ and OH DEAR LORD it's the "Mother" series: http://imageshack.us/photo/my-images/525/506p.jpg/
Let me tell you about "Mother". You have to sell your kidneys to get those games. They're some of the best games ever written and they're also some of the hardest to find.
Update: Now that I have looked at the actual list I see it contains some other incredible pieces, such as a sealed copy of Chrono Trigger (in 2008 one such copy sold for $1,217), Bubble Bobble part 2 (at least $100), Sonic the Hedgehog ($300+), Suikoden II ($140+), Virtual Lab ($900+), SD Gundam Dimension Wars ($700+), Jack Bros. ($120+), sealed Ibara ($180+), ...
Update 2: That sealed copy of Chrono Trigger is for the DS, sorry. But Virtual Lab looks legit.
Technically, my signed (by Bill Gates and Paul Allen) copy of "The MS-DOS Encyclopedia" was supposedly worth about £500 but it went on eBay for £25. And for that I had a nice curry.
If someone buys this lot for $550k, it's worth $550k.
You probably could have found a buyer willing to pay £500 for your intaglio, but it's all about market reach.
This is why sniping on eBay for badly listed stuff can still earn you a small fortune. I bought a pair of mislabeled oil paintings with provenance on eBay for £45, and sold them at Sotheby's for, um, more than that.
But where would you go to find a buyer for computer manuals signed by billionaires? Or old computer games and long obsolete hardware?
I always imagined you'd have to have a specific contact in mind when you buy such things and hope to flog it to them. And to whom do you go to if you had the money and wanted niche object X?
Also, you can always re-sell on eBay and break up the lot.
The accumulated effort of building your house – and thus the worth – is encapsulated right there in the number of rooms, location, and condition. In fact, I'd bet the human effort in building a house (planning, building, decorating) is more than the cost of bricks and mortar.