I use Trello as a place to dump all my day to day tasks. I have 5 columns:
SOMEDAY, TODO, DOING, ONHOLD, DONE
SOMEDAY = Medium to long-term tasks
TODO = Tasks that need to be done soonish
DOING = Tasks that need to be done today or that I am currently doing
ONHOLD = Waiting for someone else or another department
DONE = Task is complete
If an on-the-fly request comes in, I just dump it straight into the correct column depending on the expected resolution time-frame!
Hope this helps!