Not meant to discourage but maybe you can get some inspiration from Belvedere
Maybe adding options to dynamically create folders based on date, or put up some pre-defined rules like, auto-sort by extension and create folders based on the extensions and/or type. Example predefined rules would be:
*.pdf --> Goes to PDF folder
*.xls; *.doc; *.ppt --> goes to MSOffice folder
*.jpg;*.gif;*.png --> goes to Images folder
...and yes, it's great that it will be a portable app.