I don't have a physical tickler file. Working between the home and office would make it difficult to tickle things when I was in the location away from the tickler file.

What I do have is a tickler list on the same list manager as my context lists. The hack I use it to set the start date of the tickler item to some date in the future. That way, it doesn't become visible until the day I want to be reminded.

The second important part is checking it. For this, my "Hard Landscape" screen on my tablet comes in handy. I've set it up so that it shows me all the calendar items for that day, all the actions that are due that day, a few of the upcoming actions and and actions that are overdue. (of course, this only ever happens because I forget to check them off. I'm always on time with my work. ) But this hard landscape screen also has a widget displaying tickler items.

It works really well. I have one screen where I can check my calendar, deadlines and ticklers at the start of the day. I can have my shower and breakfast without worrying about anything.