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: 
Looks like Apple answered my prayers themselves:

<http://www.apple.com/macosx/mountain-lion/messages-beta/>

What a lot of posters weren't getting is that I don't want to use synced notes and email because that requires a tedious "compose" stage and also leaves behind a bunch of clutter that I either have to search through or delete later.

iMessage lets me quickly send a new message and/or file, lets focus on the latest message, and automatically gets rid of earlier messages over time.
Currently, the best app for this is [DeskConnect](http://deskconnect.com/).