Technology demos - sometimes not very impressive

The last couple of days I've seen a few demos of potentially interesting technology that when you get to it they are just not there yet. One I mentioned on my last post, so I decided to increase the list:

The first one, as most people are already talking a lot about, is Cuil. There are lots of articles about it out there, so I won't write much besides saying that it's quite impressively fast, but relevance is worse even than MSN Search on its early days (and that's a hard thing to beat).

Then, going to a whole different type of technology, there is the Martin Jetpack. It claims to be able to run for 30 minutes and get to 8K feet, but the demo is underwhelming: a guy with a big thing on his back making a lot of noise and then two guys around him guiding him around hovering a couple of feet off the ground. A few balloons and a lawn chair seem way more efficient.