It seems that some anime are being re-made or finished. Full Metal Alchemist is an example of that. They waited until the manga was finished and made an entirely new series, Full Metal Alchemist: Brotherhood to finish the storyline. Something similar happened with Inuyasha: Final Chapters.
Anyways, these are the animes I wish would resume where they left off or continue as the manga is still doing:
1. Air Gear
2. Tenjou Tenge
3. History's Strongest Disciple Kenichi
4. Soul Eater
5. Hunter x Hunter
6. Yakitate!! Japan
Once the top 3 are over - One Piece, Naruto, and Bleach, I can only think of the above 7 to take their place. All of the above anime have either ended abruptly or have some cliffhanger ending.