Tell me you have a simple way of having an idea "here" and remembering or reviewing the idea "there."
Personally, I am a fan of Reqall. (Tell them I sent you, who knows...It might get ya something!)
I have even made it easier to be "out and about," having a life while making it ok to have ideas that are unrelated to what I am doing.
*** Note: You who know me KNOW I usually travel (yes, even to dinner!) with my Moleskine notebook. I use Reqall "in between" times...
How I Do It:
After a meeting, while I'm waiting to meet someone, when I'm at a bookstore doing research, I just may have an idea about what I'm not thinking about - make sense? When I do, I simply call Reqall, start talking, hang up, and go back to what I was doing.
I even set up a "rule" in my email: Any transcriptions bypass my Inbox and go straight into a "Transcription" file. I start my morning reviewing that file, moving anything there to my calendar, tasks or along to someone who needs it!