Currently you can add attachment(files) and URLs to thoughts - you can see them in the thoughts tab. I would suggest to make this information more visible. When you hoover over a link you see the internet page - helping to refresh the brain.
I describe an example: Hope you already stumbled over pearltrees ? http://www.pearltrees.com . This is in fact a graphical based site to structure your internet url's in a knowledge tree. Most site were just presenting that in a simple list based on time of registering the URL. In fact they are only concentrated on URL's - in fact Thebrain contains this view also !! Please take an account there and look at the way they organised the the trees. You could find some idea's there to elaborate the presentation of these in Thebrain.
So when hoovering over the list of attachments/url's of a thought it should visualis the content.
I would have liked to add some screenshots to explain this but your forum is really not build to allow that. I would suggest to review the tool where you can capture idea's with. The reason is simple: the more ideas you get the better your product becomes. Hopefully you give reaction on them to inform the owner of the idea what you intend to do with it.
Would like to add also the following: Attachment should get also more meta-data fields. The standard meta-data coming from the filesystem in case of an external link to a file.(size, date creation, updated, type of file) as brain user specific added meta-data like: summary of content of the file, subject it covers. This would lead to the possibility to create a 'brain activity' time-line. How many times I am confronted with someone asking me to give me a copy of a document containing some specific idea's and concepts, when i have been working on it in the last 3 months the chance to find it is still big but when later it becomes more difficult. Therefore it would be of great help to have a timeline that represents what you did in your brain and when. This timeline should be dynamic so that you can just walk through it in function of time. Sometimes I remember that I worked on it about 8 months ago - so I just quickly walk through this time line starting from 8 months ago. Beside the timeline one should also have a 'brain-heatmap' where you can have an helicopter view on your brain activities in order to see if you are really going the right direction in goals of your live and not be hold up be unnecessary activities leading to procrastination and disorientation from the goals you planned.