Need a tool: visual software sketchbook thingy

I'm in Seattle temporarily, doing some work for a friend and while trying to land a client in NYC.

I realized I have a problem: I can't think online anymore.

What I mean is, I used to be able to work through ideas, jottings, and diagrams on a computer, using something as simple as MS Word (ok, MS Word is not the best example, but my point is I did this with no fancy E-R diagramming tools, not Visio, etc).

Anyway, I can't do it now. I keep needing to grab a pad of paper and scratch things out, drawing arrows and notations etc.

All fine and good, but I really need to be able to do this online so I can reference and pull in information, and then take whatever mess I've made and turn it into something else (a document, a presentation, a spreadsheet).

I'm not even sure what I'm looking for, something that combines Visio (a very light, and simple Visio please) with a database or way of tagging bits of info, with some elements of a spreadsheet and MS Project thrown in for good measure.

Any ideas? Send them as email or add comments please...

Mod: would help if I could spell