I was watching the OVA for Kenichi and Asa Made Jugyou Chu! and realized how irritating a good OVA can be. I mean your sitting there watching a really good show and then have to wait anywhere from a few months like Kenichi to a few years like Hellsing Ultimate for the next episode to arrive. In some cases you don't even know if another episode will ever come out like Koe de Oshigoto! or Zettai Karen Children ova. I wish they would either stay with just weekly TV series or at least put out a set schedule for the ova. Some of these shows leave out way too much of the story arc and others just end abruptly.
Here is a list of OVA that I have watched that haven't put out an episode for a while wither i liked it or not
Kenichi history's strongest disciple
Asa Made Jugyou Chu!
Zettai Karen Children ova
Koe de Oshigoto!
Baby Princess 3D Paradise Love!
Holy Knight OVA
Kaibutsu Oujo Princess Resurrection
Rurouni Kenshin New Kyoto Arc
Negima ova (Skipped around to much but the liked the ending better than the manga's.)
Zenyaku] Busou Shinki - Moon Angel
Are there any OVA you like and you wish it were a regular series or any series that turned OVA and you wish it just kept going on instead?