I love the first opening to Hunter X Hunter (fav. anime ever!), makes me feel right at home :)
[youtube]http://www.youtube.com/watch?v=1IAOZn2YwiQ[/youtube]
I love how they mixed it into the show on harmonica. I actually bought a harmonica just so I could learn to play this song :P
Second Opening is great too :)
I also really like the opening and most of the music in general from SDF: Macross
[youtube]http://www.youtube.com/watch?v=Cz4c0578_So[/youtube]
I'm so pumped now!