Perhaps an old topic - apps for taking notes, drawing diagrams, sharing, etc

Tried searching up some threads but none seemed to really stand out.

I'm an engineer. I do a lot of note taking, working out equations, brainstorming on whiteboards, sketching things out, etc. Invariably this takes up dozens of sheets of paper on my desk, which are a pain to sort through later... or there's the practice of taking a picture of a whiteboard's contents with my phone and emailing it to myself.

Would be nice to have an app for this sort of thing - something to do what the Note Slate is claiming to do when it's released. While I'd be tempted to buy that, I already have a Droid X and will likely get an Android tablet in the future. I've seen the 'Evernote' app but that seems to be geared toward pure text input, and I definitely would need something where I can draw things out too. Functional on both a phone and tablet would be ideal.

Any suggestions? Seems silly if this sort of thing doesn't exist yet.