If you're a blogger or want to write on a consistent schedule, it's important to keep a log of article ideas, those your are currently working on and those you have completed.
One way to do it is to use Remember the Milk to track all these stages of development.

First setup a list for you blog ideas. This is where you keep all your articles and posts. Secondly create a set of tag to introduce a simple workflow to manage those items:
-create a tag "@draft" to indicate writing you're currently working on
-create a tag "published" with the task name the same a post title.
Thirdly create smart list to manage the views:
-create a smart list to show you tasks with out a tag with in the Blog list this way you can identify future ideas
-create a smart list to show you all your writing "@draft" stage
-create a smart list to show all "published" articles.

The overall workflow is very simple, once a week review your post ideas and assign "@drat" tag to those you would like to progress that week. Once you've finished writing remove the "@draft" and assign "published" tag to the task. Then you can review your smart list at any stage to check where you're and what needs your attention.

Of course you can always pick something from your ideas pile every time you decide that you can't make a progress o any of the "@draft" stage articles.

Enjoy