I have an @waitingfor e-mail subfolder in Outlook where I store e-mails that are waiting for replies. I have it automated so that I cc myself and the cc goes straight to the @waitingfor folder. The folder is filtered so that I can see items by the person to whom they were sent. I review my @waitingfor folder at least once a week.
For paper items, I do not use an @waitingfor folder. Instead, I store these items in my tickler files for follow up at a later date. I do not have a lot of paper items in my tickler files, so it is not too hard to find something if I need it.
For other @waitingfors, such as return telephone calls, I record these in the Palm Task list in a "waiting for" category. This is where most of my waiting fors go, including both work and home items.
I do not feel the need to use an @waitingfor category in my home e-mail. For the few waitingfors on that end, I just put them in my Palm task list. I'm experimenting with my home tickler system, because I find that I don't use it that much. I'm thinking of keeping it but eliminating the daily folders and just keeping immediate stuff in the current month or a smaller number of folders, such as one for each week of the current month or perhaps a weekday and weekend folder.
I find that if there are too many places to look, I start to go numb and don't cue into the reminders as well. Therefore, I try to keep as few places as possible. It helps to experiment with different methods to see what works best for you.