Post Location via Email like this [New York, NY] or {37.961523,-120.413452}

Just as the title says, this plugin will let you post a location from within your post’s content.. great for emailing posts or using front-end posting plugins in combo.

REQUIRES CURL!

Just through this into a php file and save it in your plugin directory!

<?php

/*
Plugin Name: Geocode My Post
Description: Geocodes an address within a post's content. Include the address in [ ] ie. [San Francisco, CA]

*/

	function geocode_my_post ($postID)
	{

		//	Get post content.
		$postContent = get_post_field('post_content', $postID);
		//	Search for location name.
		$locationBegin = strpos($postContent, '[');
		$locationEnd = strpos($postContent, ']');
		if ( $locationBegin !== false && $locationEnd !== false && $locationEnd > $locationBegin )
		{
			//	If found, geocode location.
			$location = substr($postContent, ++$locationBegin, $locationEnd - $locationBegin);
			//	Make sure that the data is OK.
			if ( preg_match('/^[A-Za-z0-9, ]+$/', $location) !== 1 ) { return; }
			//	Retrieve coordinates for this address from Google.
			$connection = curl_init('http://maps.googleapis.com/maps/api/geocode/json?address=' . urlencode($location) . '&sensor=false');
			curl_setopt($connection, CURLOPT_RETURNTRANSFER, true);
			$googleapiresponse = json_decode(curl_exec($connection), true);
			//	Do some error checking.
			if ( is_array($googleapiresponse) && array_key_exists('status', $googleapiresponse) && $googleapiresponse['status'] == 'OK' )
			{
				$latitude = $googleapiresponse['results'][0]['geometry']['location']['lat'];
				$longitude = $googleapiresponse['results'][0]['geometry']['location']['lng'];
				//	Save location coords to post meta.
				add_post_meta($postID, '_wp_geo_latitude', $latitude, true) or update_post_meta($postID, '_wp_geo_latitude', $latitude);
				add_post_meta($postID, '_wp_geo_longitude', $longitude, true) or update_post_meta($postID, '_wp_geo_longitude', $longitude);
			}
		}

		//add lat lon if in {}
		$locationgeoBegin = strpos($postContent, '{');
		$locationgeoEnd = strpos($postContent, '}');

			//	If found, split lat/lon and add to meta.

				if ( $locationgeoBegin !== false && $locationgeoEnd !== false && $locationgeoEnd > $locationgeoBegin )
				{
			$locationgeo = substr($postContent, ++$locationgeoBegin, $locationgeoEnd - 1);

				list($latgeo,$longeo)=split(",", $locationgeo);

		                add_post_meta($post_id, '_wp_geo_latitude', $latgeo, true);
		                add_post_meta($post_id, '_wp_geo_longitude', $longeo, true);

		}
	}

	//	WAS 'publish_post' before WP 2.3
//	add_action("{$new_status}_{$post->post_type}", 'geocode_my_post');
	add_action("publish_post", 'geocode_my_post');
//	add_action("trigger_mah_error", 'geocode_my_post');

?>

http://wordpress.org/extend/plugins/wp-geo/