Almost made my top 10 (random order starting from here): Libertango- the clip with sequences from the movie Tango Lesson, music by Piazzola (featuring Yo Yo Ma), I talked about the clip here; A quai and Rue des Cascades, music by Yann Tiersen, I talked about the clips here and here, respectively; Desaparecido and Clandestino, music by Manu Chao, I talked about both clips here; Number 1 and Strict Machine, music by Goldfrapp, I talked about the clips here; '68 and Revolution, music by Anima Sound System, I talked about the clips here; Zece, music by Florin Chilian, I talked about the clip here; When the Lady Smiles and Quiet Eyes, music by Golden Earring, I talked about the clips here. More: I also thought that the following two videoclips were absolutely great and in perfect harmony with the corresponding music, despite the fact that they were not the original videoclips of the song (I think they should be recognized as such :-)): Dark Waltz- sequences from The Phantom of the Opera movie, music by Hayley Westenra, I talked about it here and respectively (to end with Yann Tiersen, of course!), Comptine d'un autre été - a self-made animation as far as I understand, with music by Yann Tiersen, I talked about this here.
Update, 4th of April: After Edina draw my attention to a huge flaw of mine (see comments section) :-), I apologize and add the videoclip and details here. It is not in my top 10, but could have made it :-). And we are actually talking about two videoclips of the Magyarorszag song. I have talked about both of them here. The original videoclip is here, music by Olah Ibolya; the one I like better (but not the intro to it!) is the "collective one" from here, with many Hungarian artists and Olah Ibolya being the last to sing.