Quite a number of the incorrect predictions are related to one development only: speech recognition. The speech recognition software we have nowadays is not yet sophisticated enough to encourage wider use. (And it won't become sophisticated enough until it incorporates (near-)human-level context knowledge for disambiguation.) So, all the predictions of it being the main interaction channel with our computers is not borne out.
Another, connected set of predictions, deals with machine translation and is not borne out at this time for the same reasons.
The first set (about portable computers) can be seen as mainly correct, except for the objects which are listed as portable computers for daily use. Instead of earrings and other jewelry we have cell phones and PAs, mp3 players, other media players, GPS nav systems in cars. The trend here is towards incorporating all of it into one object, rather than distributing into several and connecting them with a LAN. Look at how the cell phones/PAs evolved in the last few years: web browsers, emails, media players, document editors, calculators, converters, GPS or other (Google Maps) navigation, etc. I would look to them becoming the "portable computers" of Kurzweil's prediction.
The rest is not that far from the current state of technology.
This seems worth posting around now... As I've previously observed, futuristic visions are produced as entertainment, sold today and consumed today. A TV station interviewing an economic or diplomatic pundit doesn't bother to show what that pundit predicted three years ago and how the predictions turned out. Why would they? Futurism Isn't About Prediction.
But someone on the ImmInst forum actually went and compiled a list of Ray Kurzweil's predictions in 1999 for the years 2000-2009. We're not out of 2009 yet, but right now it's not looking good...
Now, just to be clear, I don't want you to look at all that and think, "Gee, the future goes more slowly than expected - technological progress must be naturally slow."
More like, "Where are you pulling all these burdensome details from, anyway?"
If you looked at all that and said, "Ha ha, how wrong; now I have my own amazing prediction for what the future will be like, it won't be like that," then you're really missing the whole "you have to work a whole lot harder to produce veridical beliefs about the future, and often the info you want is simply not obtainable" business.