@Kareem:
Yeah the biggest problem of European comics is that they aren't particularly accessible compared to American comics and Manga. As an American I wouldn't know where to look for them.
There's a publishing company called Cinebook which publishes English translated editions of French and Belgian comics.
They have a lot of great stuff, titles like Lucky Luke, XIII, Spirou & Fantasio, Thorgal, Valerian, Aldebaran, Blake & Mortimer, Largo Winch, Papyrus, etc.
Fantagraphics has a nice selection of works from the likes of Lewis Trondheim, Jason, Thomas Ott, Jacques Tardi and Gipi.
http://www.fantagraphics.com/index.php?option=com_virtuemart&page=shop.browse&category_id=604&Itemid=62
http://www.fantagraphics.com/index.php?option=com_virtuemart&page=shop.browse&category_id=318&Itemid=62
http://www.fantagraphics.com/index.php?option=com_virtuemart&page=shop.browse&category_id=305&Itemid=62
http://www.fantagraphics.com/index.php?option=com_virtuemart&page=shop.browse&category_id=391&Itemid=62
http://www.fantagraphics.com/index.php?option=com_virtuemart&page=shop.browse&category_id=325&Itemid=62