This was an interesting article, and I'm still digesting it.

Right now, I still tend to favor page based web applications with some client side code (Ajax, probably jQuery).

Sorry to punt to someone else's words here, but I think DHH summed it up pretty well, so I'll just give a link and a quote:

http://bigthink.com/ideas/21596

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Question: The trend now is towards client-side applications, but Rails deals primarily with server code. Does Rails need to evolve to keep up?

David Hansson: So Rails have actually been interested in the client side for a long time. When AJAX sort of first got its initial push, when it got its acronym, back in, I think, 2006, Rails was one of the first server-side frameworks that said, "This is going to be huge and we're going to do something about that." So we put a Java script library straight in the Rails distribution prototype and we built a bunch of helpers around that to make it easier to create AJAX applications with Rails. And today it's almost inconceivable that you'll build a new, modern web application that doesn't have some aspect of AJAX in it.

Now, some people go a lot further than just having some aspects of AJAX in it. Some people have their entire application in Java script and just use the back end as a data store for that. I don't find that development experience that pleasurable. I have come to tolerate Java script now that there are great libraries and frameworks like Prototype around it to sort of make it a little more pleasurable, but it's still no Ruby. Ruby is still my first love in terms of programming languages. And however much you paint up Java script, it's not going to beat that. Which is fine.

So, from the development side of things, I don't enjoy Java script programming nearly as much or in the same league as I enjoy Ruby programming. Okay, fine. On the client side of things, like is this better for the user? I think there's something special and appealing to me about the mix, the mix of how the web is discreet pages and you use hyperlinks to jump from place to place and AJAX is sort of sprinkled across to make certain common operations a little faster. I tend not to like very heavy, single-screen-based web applications. They can be fine for some things, but I think the Web has this unique category of applications that fit into that sort of middle ground between one screen, or mainly one-screen applications and static web pages. And that's an awesome sweet spot and I think it works incredibly well for a wide array of applications. And I wouldn't want them to be any different. There are certainly some people developing for the web who long for the days of the desktop application and finally see that now AJAX is bringing that back. Well, we've heard that story a lot of times. First it was Java that was going to do this, applets were going to bring back the desktop experience and we could get rid of this nasty HTML. Then it was Flash that would bring this forward. And now AJAX or anything else like that. There's been so many attempts to bring the desktop to the web, and none of them have succeeded in becoming the dominant approach to building web applications, and I think there's a good reason for that, because that's not what users want. Like that sweet spot in the middle is great and it's actually desirable on its own terms.

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For now, I'm pretty happy in that middle ground as well... though it will be interesting to see where this goes next.