Found a great extension to BlogEngine.net today (article is more than a year old Tongue out) in the shape of the Slide.Show silverlight gallery.
It enables you to upload set of images to a gallery directory and makes it available to your Blog by simply putting the followgin tag into your blogpost (remove the spaces and replace the <location> tag):

[ silverlightslideshow:<location> ]

More info on:
http://beckelman.net/post/2008/01/Code-For-SlideShow-Extension-for-BlogEngineNet.aspx

Example:
[silverlightslideshow:example]