For me the key difference is that one task can be tagged multiple times, whereas a task can only be in one folder at a time. So, if I have a task that needs to be brought up with different people - maybe one supervisor, one committee, and one employee that I supervise, I can put a tag for each on it and it will show up on each person/groups list.
When using the dashboard widget for the Macintosh - it looks like I have to sign out and sign back in before any newly entered tasks will show up in the widget. By newly entered, I mean entered since the last time I signed in with the widget. Has anyone else had a similar experience, and/or is there anything I should be doing differently?
I am running on Leopard, and I have both the web interface and the widget logged in simultaneously.