I just started using Sticky.io to jot down all my thoughts. I also used evernote in the past but I did not like the search functionality and or the app. If I was on the go and had an idea I would have to open the app, open the folder "Ideas" and then write down my thoughts there.

With Sticky it is 100x easier/faster, you can send in notes via SMS, gchat, or web browser. I personally like the sms feature, it makes taking notes on the go so easy. Also it allows you to organize notes on the fly. For example you can write this note:

@ideas create the next facebook. #todo

Now I have a new note in my ideas folder and it is tagged with "todo". I have only been using it for a few weeks but I love it so far. Hope this helps!