Mapping Plugins

Hi All,

I have been using WP to create sites for about a year and love it. Now I am looking to create a site with mapping functionality that includes the following:

– Allows users to register and post their location (so it shows up pinned on a map)
– Allows users to search a map to see pins in their area
– Geo-recognition that detects where users are located (nice to have)

Does such a plugin exist? I searched and did see some cool mapping plugins but none seemed to have this functionality. Any WP mapping experts out there? Thanks!