Today while I was doing some research for a carousel gallery for WordPress, I came upon this great tutorial on NetTuts. It’s a really, really simple idea – one of those ‘why didn’t I think of that’ things.
Basically, you create a category into which you’ll only post newsletter contents. Hide the category from other posts, then set up an RSS feed that only includes that category.
Get a FeedBurner account, then give them that new RSS feed and use their email update feature to send out your newsletter posts. So easy!