If you want to keep all your information in one file with open structure you're welcome to try ErgoNotes for Desktop. It allows to store different data in one XML file organizing it in a tree structure.
You can choose one of more than 250 icons to describe the meaning of nodes in your tree.
If you need to to store some private data ErgoNotes offers a strong encryption mechanism allowing to encrypt any node of the tree with its own password.
Search feature helps you to find any information in the tree without difficulty.
Furthermore, if you have a Pocket PC then ErgoNotes allows you to open the document using either
Desktop of Pocket version of ErgoNotes (or even work with the document in both versions simultaneously). Desktop version takes an advantage of the drag and drop functionality so you can easily move the data from and to other applications.