Sometimes as per your requirement, you may not like some default features of WordPress. For example, Self Ping or The <p> that is automatically inserted etc. Disabler is a simple WordPress plugin to disable few such default features of WordPress.
The following are the features you can turn off.
Front End Settings
Texturization (including Smart/Curly quotes, EM dash, EN dash, and ellipsis)
The automatic capitalization of the P in WordPress (WordPress 3.0+ only)
that is automatically inserted
Back End Settings
Autosaving of posts
Outputting WordPress version in your blog headers
Sending your blog URL to WordPress when checking for updates on core/theme/plugins