Both Projects & Checklists work
Most of my recurring actions are contained within projects.
Some are set to reoccur automatically some certain time after completion, some have start and deadline dates and some are more free form being activated to do during weekly review when I think they need to be done not on any specific time.
I also have some recurring projects that are checklists. Basic household management (cleaning, trash, laundry) are checklists as is my list of groceries to buy.
But for example I add a next action of go to store X in the context of which of 2 major towns I need to do it to my GTD list whenever we have items on the shopping list to buy there.
One reason is we go shopping so rarely, major shopping is a once a month item. And right now we're stocking up because at the end of this month we will be lambing for the next two months and I may not be able to get away to go shopping at all during that time. So I have to predict ahead what we need and have plenty on hand to make it through lambing.
Recurring actions fit very well into either the project/NA model or the checklist model depending on how you think of them. That's part of why I have both types and probably why GTD doesn't put them in a separate class. What will work for you regarding recurring actions will vary with your temperament and your style and the jobs themselves.
Oogie McGuire - Mac, iPhone & Omnifocus
OogieM on Twitter
Paonia, CO USA