Here's one for you, and it's free. CaseNotes from QCC Information Security. CaseNotes is easy to use, easy to customise, and very functional across the entire spectrum of cases that we work.
You can define the Metadata fields, or information that you wish to collect in the Preferences panel. Then, simply enter the details of the case and begin. CaseNotes builds the report as you enter new information.
You can even customise the tabs, keeping Reports separate from Notes and Audit Logs.
As the name implies, entries are handled with Notes. Just click on the Yellow Sticky icon to create a new note. Once you've entered the information and clicked save, the program not only stores the info but creates a hash value for the entry which becomes a part of the audit log.
The program is deceptively simple, yet incredibly functional and powerful. The only drawback is that it's a Windows only product. Still and all, with all of the functionality that you get in this free program, it's worth firing up the virtual machine to take notes. If you are looking for a note taking solution, this product should be your first stop.