I've been keeping an open 'ideas' file since the early 90s. It originally started as a paper based folder that I would drop varies notes and scraps into. Over the years it evolved to be entirely digital as I can type much faster than I can write. Currently however I find that I'm capturing these ideas on multiple devices and in multiple formats so synchronization has become an issue. My current solution has been to use Gmail as my idea aggregator.
It started when I was capturing some idea that popped into my head on my laptop at work. Since I had my work hard drive in, (I don't keep any personal data on this drive), I decided to email the file home. Once I got home however I had to ask myself why not just leave it in in Gmail? It has plenty of space. Now I'm authoring all my new idea content in Gmail directly. It has a nice rich text editor, tags/labels, spell check and search. You can also attach files. And the big plus is that I can access it from all my PCs (work and home), my laptop, and my PocketPC. I'm currently creating these files as drafts since it allows me to come back and edit them later.
Now I find that I'm tempted to use something like Gmail FS or Gmail Drive to store all my stuff there. I'm not sure I want to get involved in an arms race between Google and the util authors. I know that these things get broken periodically. Back in the Dot Com days there were a bunch of internet file storage companies. Did any of these survive? Are any of you using something like this you would recommend?