(More shameless self promoting, I'm afraid)
Some time ago, at the start of this year, various members of the GtD_Palm Yahoo! Group created a method for doing GtD without a separate projects list. It was my post that started it all off, so although it's by no means all my own ideas, it became called the PigPog Method.
Anyway, I've just got around to writing an article about it...
If you use computerised lists - Palm, Outlook, Pocket PC, or just about anything else - this is a way of avoiding the hassle of trying to keep all your projects and their associated next actions tied together. It means you can only have one next action for each project, but depending on the sort of projects you deal with, the payoff could well be worth it.