Is there such a thing? Maybe there should be, I don't think Microsoft built anything like this but is there a similar format or framework for ASP.NET that let's you deploy an archive -- that is -- your ASP.NET web application, or module that works in the same way?
A xap file is a self-contained archive. I'm particularly interested in the things they're showing with Silverlight 4 and application partitioning. In that you can drop in additional xap files that extend or show up as new things in your app without recompiling the existing stuff.