SDMB+weekly review = 7-day tickler
The tickler, in practice, puts a piece of paper or a some other cue that stands for an action or thought into a 3-D ( mechanical )and perpetual calendar so that you can find it on a certain date and then do something with it (take it with you, act on it, move it further along, etc). The tickler as we usually speak of it has a "look at" interval equal to one day. The weekly review is basically putting all your projects, both the active ones and SDMB ones, into a tickler with a seven-day "look at" interval. The question is do you have SDMB projects that you want to be cued to examine at a shorter interval, or perhaps a longer interval?
Why would you? GTD as we know it basically says that a project is ACTIVE if you are commited to doing something specific within a known time span (usually 1 week,--please correct me if I am wrong), or at a specific time in the future of which you are cognizant and you have a way of cueing yourself to remember (appointment on calendar). It is SDMB if it does not meet one of these requirements and it should be reviewed every 7 days to decide if you will do an action related to it within the next 7 days, or if not, at a specific time in the future. If it is not either of these, it remains SDMB. However, these time intervals may not suit everything that crosses into our thoughts.
Practical issues: There can be a lot of time involved at looking at dozens of SDMBs and they may vary in when they are even useful to think about. A medical student might want to review most of the SDMBs after the semester is over for example. So sometimes certain things are better handled on a list, but with a SDMB for looking at the list, with or without a proposed date range. Most of us would rather put books of interest on a list rather than as individual SDMBs.
Comfort level: Sometimes it is uncomfortable to lump together things we know we have to do or should do with wishes, hopes, and intentions. "Mom's ashes are cast into the Pacific" does not feel like it should sit with "Toured Paris Night Spots".
Level of Life Control: Sometimes life actions that could and should be routine are not routine (for any of a host of reasons) and thus we are always making ACTIVE PROJECTS and SDMBS for putting out fires. You might not be comfortable with "Electric Bill is paid on time" and Master the Tango in the same category.
Given all of the above, note the possible benefits of having one big SDMB list:
1. I think that DA comes out of some of "new age" thinking that holds as a basic truth that if you keep thinking about things or conditions as being so that are not yet so, that they will come to be. You need to decide if philosophy fits you or not.
2. If SDMB gets too big and cumbersome you may see some patterns or ways of handling things that work better for you, for example as lists or perhaps you discover that some SDMB items are part of a set of guiding values so you will move them up in your system as higher altitude stuff. Or, you may decide you want to let them go because they don't really reflect who you are or want to be.