Today, many web applications use alot of javascript to create a nice experiance for the user. With libraries like jQuery it is very easy to create that little extra that gives you this "woow" feeling. I use alot of javascript as well and I think it´s pretty fun writing when using a library like jQuery. One problem, however, that I often see in applications is that the html markup is depenting on the javascript. If the javascript doesn´t work correctly, then the markup is screwed up.

In my opinion javascript should be there to extend existing markup, not creating it. I tend to use a ".js file per view" approach while developing. Where I first create my view and make sure it work the way it´s supposed to without javascript. I then add a js file for that view and change the behaviour of some functionality. For instance I could do a asyncronas post instead of a normal form post or I can display some data in a popup instead of in a new page. This way you make sure you have unobtrusive javascript code and the javascript code is seperated from your html. I tend not to declare my events (like OnClick) directly in the markup, I´d much rather declare it seperatly. You can do this very easily with jQuery, like this:

.......
<input type="text" id="TextBox" />
.......

<script type="text/javascript">
$("#TextBox").click(function() {
      //Do something
});
</script>

To me that looks alot better then this:

.......
<input type="text" id="TextBox" OnClick="CallFunction();" />
.......

<script type="text/javascript">
function CallFunction() {
     //Do something
}
</script>

This way you can read your .js file and understand most of what it does without looking at the markup and the view will be a bit cleaner and contain only html markup as it should, in my opinion. I see javascript as a layer above the html that you use to tweek the markup in a desirable way. I like to keep javascript in a file of it´s own, but that is just a personal preferance and there is nothing wrong with puting it in the view, as long as it is in the bottom where it belongs.