If you feel the need to quickly organize ideas or brainstorm with others, you might find peace in using a mind mapping tool. I've looked at NovaMind in the past but it wasn't until I sat down for lunch with a buddy, Matt Hollingsworth, on his TabletPC (sheeks of horror ensue) that I saw the power of these tools.
Often I'll jot ideas on 3x5 note cards and return to them with an outliner tool such as Omni's or maybe VoodooPad but often crave paper instead. What I usually end up with is sort of like the "maps" that mind mapping software can create. The bonus to not having it "stuck" on paper is, of course, that I can more easily share it; add tasks; or continue with an expandable canvas.
I only know Mindjet from Matt's demo and his use of it at the recent CocoaDevHouse. If Omni Graffle is one of the must-have Mac apps, I have a feeling that Windows users feel that same about Mindjet and for that matter may not consider a switch to OS X thinkable. Thanks to Mindjet for realizing the potential of Mac professional market.
Join their beta here (opens March 29th). It sounds like they need more beta participants and I know you guys are just the right folks to make sure they do things right.