Post organization is as timethief says, done with categories in wordpress. Take a look at this post by Panos which should give you more on how to go about it.
One note I'll add though is do not title your categories with names something like 1/1/11. That will result in all sorts of errors as it will get mixed up with the standard archives features. Instead, make you categories something like Jan 1, 2011.
The one thing with doing a separate category for each day is that in two years you are going to have 730 categories. If you use standard static pages, again you are going to have 730 pages after just two years. This is going to drive the search engines absolutely crazy and is going to severely dilute your page rank over all those pages.
It would be better to use standard posts and then rely on the archives widget to allow people to bring up a month's worth of posts.
Alternately, you could use a text widget and use the archives shortcode with type=daily, or you could put the archives shortcode on a page. See http://opposablethumbz.wordpress.com/archive-daily/ for a sample of what it would look like.