Ubernote is an online notebook program that could be a very useful research project management tool. It allows for saving bookmarks, copying in clips from web pages, and writing notes. You can even email in notes to yourself, making it a convenient place to store information found during a library visit.
You might even consider it as a journaling tool if you want to keep a private journal online where you can access it from multiple computers or even from your mobile phone. Because notes can be tagged and organized, finding specific entries again when you want to read them should be a snap.
Try it out, and if it’s sort of what you’re looking for but not quite, read this article at Mashable to find out about other online notebook tools.