Eventr plugin lets you use your blog an an event management tool. You can create an event – the plugin will let people sign up for the event – it can also show a list of all the attendees. Once the event is done, you can deactivate the event and no more sign up will be allowed.
My second WordPress Plugin – Remote Database Backup. Its is based on the WordPress Database Backup plugin. If you are a regular wordpress user, you might be better off using WordPress Database Backup plugin instead of my version. But if you, like me, have a local server on your system and has a copy of your site on the local server as well as the online server, you will find great use for my plugin.