Question: Just like the newly presented iMessage but instead of just between iOS devices, with the Mac too.

I've looked at Handoff. It can only send links to the iPhone from the Mac.

I've looked at Droplr. It requires public sharing on a Twitter account. Not what I want.

I've been using email and have been recommended Evernote. But these solutions require a document that I must create, wait to sync, and/or later delete to free up clutter. I just want to send a quick message.

I just want an app/application pair that can quickly share links, notes, and pictures between devices, like iMessage.

Does what I desire exist?

Answer: 
I agree iMessage is the best solution. For those that (for whatever reason, may not be able to use this) here is a solution for quick notes sync. I created a contact on my iPhone called "My Notes" and put what text I want on the notes section and it instantly syncs with Address Book on my mac. And at the desktop I do the reverse, I go to the same contact and add a note in the notes section and it syncs instantly.

Quick, no file to create/save/manually sync/whatever. 

However, it's only for quick text notes, not photos/files/etc.

I thought it was cool ;) but iMessenger is more complete and now it's available... but hey, it's good to have choices.
I don't know iMessage and I can't see why you need this, but there is [Syncopy](http://appshopper.com/productivity/syncopy). Hope this does it.