Hextech Gunblade provides AD, AP, Life Steal, Spell Vamp, and a nuke/slow active.
Guinsoo's Rageblade provides AD, AP, and a stacking AP/AS buff on spell casts and auto attacks.
Trinity Force provides AD, AP, and provides tons of damage.
Items with both stats do exist for those champions that scale with both, but they are few and far between. Throughout season 2, Rageblade was mostly considered a joke item. Trinity Force is more of a bruiser item. But the Gunblade has been a strong item for Katarina, Akali, and Jax for a long time, and will likely remain so.
The biggest problem with items like these, I suspect, is that they are a nightmare to balance. If you have a champion that scales well with AD but the abilities do magic damage, it's difficult to build against them as they'll be doing a large amount of hybrid damage. That's likely why you don't see very many.