I've been trying to get Remember the Milk to function as a decent GTD system for me. It does a pretty good job, but I have found a useful trick with 'Smart Lists': 
"( NOT dueAfter:"1 week after today" ) AND ( NOT tag:someday )"
This is a smart list search that gets RTM to give you actions that are due in the next week and that you haven't tagged 'someday'. This, for me, is the ideal 'Print' view - you set this up as a list, hit print and get everything you need.
You tag things that aren't immediately actionable ("Learn French") as 'someday' so they don't appear. When you get a list like this, you need to know only that which you can act on now and this does it for me. The search criteria system is very flexible in RTM, and makes it pretty easy to customise your system. Now, the only thing I wish is that the print view allowed you to have a view of the tags attached to an item, or a decent XML export that you can get from them listing 'everything', so that custom views become a bit easier to build. (This also applies to Vitalist who are slowly getting there).
Tags: gtd, getting things done, gettingthingsdone, productivity, rememberthemilk, remember the milk, rtm
