I always like to learn new techniques. I created a panorama from 5 or 6 photos and then I used the Polar Coordinates filter in PS.
Here can you find a great tutorial in English: http://dirksphotoblog.wordpress.com/2006/09/06/tutorial-create-your-own-planets/

credits:

ANNA ASPNES
ArtPlay Palette Embrace Life http://www.oscraps.com/shop/product.php?productid=32623&cat=383&page=1
ArtPlay Palette Find My Way http://www.oscraps.com/shop/product.php?productid=27640;cat=383;page=65
ArtPlay Palette Find My Way No. 2 http://www.oscraps.com/shop/product.php?productid=27641;cat=383;page=65
Find My Way Overlays No. 3 http://www.oscraps.com/shop/product.php?productid=30328;cat=383;page=18
Life WA No. 1 http://www.oscraps.com/shop/product.php?productid=27269;cat=383;page=78

VINNIE PEARCE - Curio

Thanks for looking!
Eszter