It might sound incredibly obvious or the most basic of business advice, but the discipline of writing things down shouldn't be undervalued.
Carry a notepad when you're on the move if that's going to work for you, but otherwise make sure you've a nice note-taking app on your phone. Alternatively, carry a small digital voice recorder (most phones have these too).
Writing things down isn't just about remembering ideas - it's a trigger to act on them. When you've had an idea make some time as soon as possible to write it down, draw it out and scope it further.
Remember, mighty oaks from little acorns grow. What starts as a small adaptation to a product or passing thought can evolve into a whole new opportunity if you take the time to think it out - and don't lose that first seed of inspiration.
There are some cool tools and apps out there for plotting and sharing ideas. Popplet is my favourite, but there are plenty to choose from.
You've got great minds people - don't let them go to waste!