Looking through my iTunes collection I see a lot of anime opening themes that I like.
First up however I'm going to exclude image songs that didn't feature as part of the anime, or were one offs. So that excludes the image song for the Vampire Princess Miyu OAVs, and all of the Bubblegum Crisis songs. Also Macross Plus which didn't really have an opening theme song as such (Voices was an ending theme IIRC).
That still leaves me with way too many to choose from. Too many to list or link to. I was running out of alphabet to list with even if I left the instrumentals like Cowboy Bebop's Tank or the Twelve Kingdoms opening out.
Despite being seriously tempted by the Vision of Escaflowne opening I'm going to go with Adesso E Fortuna - Flame and Eternity which is Sherry's amazing opening to the Record of Lodoss Wars OAVs. This was one of the first anime OSTs that I bought and I love it still.
Day 1 - Very first animé: Robotech, Gall Force, Vampire Princess Miyu.
Day 2 - Favourite TV series: Card Captor Sakura.
Day 3 - Your animé crush: Oh grow UP already.
Day 4 - Favourite Film: My Neighbour Totoro.
Day 5 - Animé character you feel you are most like (or wish you were): Kinoshita, Rocket Girls.
Day 6 - Most annoying animé character: Lynn Minmei, Super Dimensional Fortress Macross.
Day 7 - Character you’d most like to slap: Hiyama Hikaru, Kimagure Orange Road.
Day 8 - Most epic scene ever: Launch day - Wings of Honneamise.
Day 9 - Saddest animé scene: The passing of the Fortune Twins - Nariya and Eriya.
Day 10 - Favourite slice of life animé: ARIA.
Day 11 - Favourite mecha series: Patlabor: The Mobile Police.
Day 12 - Best instalment of a franchise you don’t like: Mobile Suit Gundam 0080: The War In The Pocket.
Day 13 - Worst instalment of a franchise you do like: WXIII: Patlabor the Movie 3.
Day 14 - Current (or most recent) animé wallpaper: I think I had a Silent Mobius wallpaper once.
Day 15 - A reality check for a genre you like: Romantic/Heroic Space Pirates.
Day 16 - An animé classic that simply doesn’t work for you: Ghost in the Shell (film).
Day 17 - Best Background Music: Silent Mobius 2: The Motion Picture.
Day 18 - Best Five-team: Silent Mobius.
Day 19 - Change you’d like to make to any one animé: Add an animation budget to Lodoss Wars.
Day 20 - Most ambiguous animé character: Reki, Haibane Renmei.
Day 21 – Favourite OAV Series: El Hazard the Magnificent World.
Day 22 - Animation studio you'd most like to slap: Gainax.
Day 23 - Animé you think had the best, or most intriguing art: Reki's paintings in Haibane Renmei.
Day 24 - Favourite animé hero or heroine: Hitomi Kanzaki, Vision of Escaflowne
Day 25 - Best animé villain: Nakago, Fushigi Yugi
Day 26 - Your favourite harem animé: Ouran High Host Club
Day 27 - Favourite animé opening theme song: Adesso E Fortuna, Record of Lodoss Wars
Day 28 - Favourite animé companion/summoned creature
Day 29 - Best Animé Music Video
Day 30 - Favourite animé ending theme