The solutions with your problem will come in the near future, when processing speed increases. I am looking forward to that.
In the mean time, a paper/digital hybrid system is the best (for me) so far.
Capturing, quick list using paper. Organizing and reference using digital stored on a laptop and a portable device (PDA, SmartPhone, Ipod...etc) for quick reference. Small compact digital camera for quick snapshot of namecards, signs, notes on wall/whiteboard.
Maybe a list of your preferable tools and how to use them is a beneficial for everyone?