MS are offering free SL hosting at http://silverlight.live.com. All you need is a windows live ID. You can then access you uploaded applications using one of the following methods:
See my first upload at http://silverlight.services.live.com/invoke/88256/Test/iframe.html
NOTE: the …/88256/Test/… reference, refers to your ID and application name.
Method 1: Embed the application as a frame.
1) Add the following HTML to your page:
Method 2: Use a Live Control.
This method provides an enhanced Silverlight installation experience.
1) Modify the tag at the top of the page to include the xmlns:devlive attribute:
2) Add the following script references to the page header section:
3) Insert the following HTML where you want the application to appear in the body of the page:
Mark Cooper 
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