In this article I will walk you through how you can integrate a Silverlight application in Sharepoint with out using any webpart. (Download the STP file)
I will use one of my existing silverlight slide show application for this demo..
Upload your silverlight related files in the sharepoint repository, here I am uploading Silvrlight.js, Silverlight XAP file and images folder in the Shared Document library
Save & preview the page in browser you should be able to see your Silverlight application running inside Sharepoint..
Hope this help and If you have any comments, please feel free to write your feedback.