note taking

What do you expect from a note taking app?

for me i need the following:

• organizes notes into categories
• have simple text formatting, like bold, italic, indents and bullets
• wiki syntax would be cool but not a must
• stores the notes in an xml backend, could be a single file or a set of files
• tagging is a plus
• a good search tool
• i can limit access to some notes, such as notes containing confidential info like my bank account number
• i need to be able to use it on my laptop, PC and my N810tablet and sync notes between them

an excellent example of this is the good old palm software, i had a sony clie (black and white, 16M of mem
perfect for note taking, and the linux client was jpilot which simply synched and provided the exact same functionality

if you my dear reader know of any app that can do that, kindly share it.