I cannot decide if this matters or not. Seriously, will this matter? I have web apps, I have web apps that would rock in a desktop environment where I didn't have to host the data, or could at least "sync" it with the desktop.
But does it matter? Will Chrome matter? Will telling people to install Chrome to install my app be worth it? Will other browsers follow suit?
Obviously this has so much going for it. First, it's being launched as a "store" and not just an "add-on" system. I haven't written my apps for Firefox because I need it to financially make sense. Creating something for another "store" does make sense.
I can now write apps for Android, iPhone, Palm, RIM, Windows, Mac, iPad, web-based, and other cell phones. Now add "browser-desktop" into the mix.
This means I have to write my app in Java with Android's SDK, Objective-C, (uhm?), Java, .Net Pascal C etc, more C, more C, PHP/Ruby/.Net/Python, more Java, HTML5? Uhgo.
Good Lord!!! Can I just write one app in Flash or Java and be able to distribute it everywhere PLEASE???
Note that there are tons of things to figure out in terms of network latency and up/downtime, some of which are addressed by the newer features of html5.
If you really want to actually target all environments flash really no longer will be an option and it may or may not be a good thing but if your apps are as great as you think they are pick the biggest market develop specifically for that market and if they are really that awesome spread out to other environments.
I don't think the idea is to tell people to install Chrome to install your app. It's just another 'retail' front for your app that can give you more exposure.
Also, I don't think the Chrome App idea is primarily designed for developers. It's designed for users, so that they have a central place to browser the next generation webapps. Clearly it's very good for Chrome users, but it might still not be worth it for developers.
(edit to reduce snark)
Which seems so weird considering this is what will make chrome os, at least in terms of the web as a desktop sort of thing.
Though they probably did this for other reasons such as a larger userbase to test with or some reason unknown to me, hopefully I'll get to try it soon when it is ported to the other OS's.