This is a plugin that I use on all my blogs. It will automatically post your content to Twitter when you create a new blog post. It is very configurable: allows for custom messages, and trackable links. This is a plugin that will work without thought (once configured) or will work even better if purpose is put into each Tweet.
Automation for Blogging
There are so many aspects to a successful blog. Adding automation whenever possible will make your blogging life easier and run smoother. This is on automation tool that is worth using. It is also one of the few that actually work reliably. The plugin can be found in the WordPress plugin repository and requires some configuring with the Twitter API. It is well documented so it is not too hard to set up – as always I am available if you want help with the setup.