
Favorite OVA is FLCL. Just flat out visual storytelling brought to extremely high heights with wondrously creative animation.
Series, probably Kuuchuu Buranko/Trapeze. This can also double as part of an answer to your best series in recent years question as it was aired in 2009. It's a fairly engaging and touching take on mental illnesses. I would also put the director's previous show, Mononoke, aired in 2007, as one of the better series of the past few years. His recent show, Tsuritama, was also the best series of it's respective season, which was last season. It's a show about fishing.
I don't really read manga, can't answer that.