Speedy Devourer - get all the Int

Items

The basic idea is to buy Power Treads and ASAP a Moon Shard to get tons of attack speed. You might want to buy a Bottle - but I don't think you will really need it - except for storing runes...
Later in the game you might wish to buy a Sheepstick ( Scythe of Vyse) and/or Shiva's Guard. Dragon Lance is also a good item as it gives you more attack range, some attack speed, a little more damage, and some HP for a near negligible price.
During the game you should continue buying Moon Shards as you want to reach 600 attack speed to get tons of Int from your enemys in seconds so they cant cast all of their skills (best case) - works against heroes like Tiny or Sven, who don't have much Int at all.

I don't really like Aghanim's Scepter on OD 'cuz you can save the enemy's team from a well placed Ravage or Black Hole or other strong AoE-Nukes/Disables.

Pros / Cons

Pros:

• Crazy Attack Speed
• Much Int = Much Damage
• Fun to play

• neither HP nor any escape machanism
• Enemy can buy Blade Mail

Creeping / Jungling

I would suggest playing OD as a mid-Laner and depending on the enemys as the Offlane Decorator :) (Not efficient but another name for him)