The tagging capabilities at the moment are mostly based on searching for a specific piece of text, e.g. #business. I would like to see this tagging feature developed a bit further, as it is exceedinly useful for organising documents within folders.
By clicking on on a #hastag, you can bring up the search for that tag. You can then add more tags to this search. However, if you have multiple documents that meet the criteria it gets difficult to scroll through all the matching documents in the little search drop down. I'd love to see this search ability expanded to full screen (if you press ENTER/the search button) to make filtering by tags easier. This would also allow you to sort those documents by date etc.
It would also be great if suggestions came up once you started typing a #. Suggestions based on other hastags used in that folder. For example, I'd start typing #bus, and it would have a little dropdown suggestion #business which can be selected by pressing ENTER.