There are such things as web applications. Yes, these tools provided by Google are applications. Just because you access them through a browser doesn't make them a "web page".
Actually, yes, they are web pages. They're AJAX-aware and DHTML-aware and CSS-aware and use complex scripting to do what they do, but they are still webpage and websites.
An application is something you install on your computer, whether that be a smartphone, desktop, laptop, or other device.
A webpage is something you access using a web browser. Yes, websites can be used to do advanced things that weren't possible just a few years ago (yes, like mapping) but in the end you are still using a web browser to view a very fancy web page. The browser is the application, the page is the content you're viewing using that application.
I have a different smartphone (still waiting for a few of the big things Apple left off the iphone; I'll probably get a second-gen one) and I don't call the web version of Google Maps an application; I reserve that term for the actual Google Maps application that I downloaded and installed to the phone. The one that doesn't require me to launch my phone's browser for use, in other words.