I think they are particularly attractive, and it's good to see the profile of this most important of anniversaries maintained. For more information, visit Norvic Philatelics - there is a much more information on the design, background information, and how to buy first day covers etc (and I also linked to their images). I have to say, I never thought I'd blog about postage stamps, but there you go!
[Post edited to remove direct links to the images]