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)
The

that is automatically inserted

Back End Settings

Self Ping
Autosaving of posts
Post Revisions
RSS Feeds

Privacy Settings

Outputting WordPress version in your blog headers
Sending your blog URL to WordPress when checking for updates on core/theme/plugins