Re: register_sidebar_widget
Derosion-
Although the WordPress widget API clearly advises developers not to use the widget functions starting with wp_, there is an issue with localization of Widgets in BuddyPress if the register_sidebar_widget() is used.
If you’re not planning on distributing your custom components or widgets, then you can code them with the register_sidebar_widget() function call instead of wp_register_sidebar_widget(). However, if you plan to make your custom component or widget available to the community, you should use wp_register_sidebar_widget() at this time.
See Changeset 1244 for more information.
