Hello there!

I'm new to the SalesForce. I'm ASP.NET developer and right now just analyzing how much flexibility and customization capability does SalesForce provide.

What I'm interested in is that Is there a way that  I can extend /tweak the existing  salesForce UI; I mean adding AJAX to enhance user experience on the VisualForce  pages or the way the user interacts.

If thats not the case then I have to build all the salesforce pages in ASP.NET using the web services to interact with salesforce API.
Plz help me with this.

Thanks