Jeremy Zawodny has announced how to ping Yahoo's RSS database when you post to your Movable Type weblog. Pinging has the advantage of getting your content much faster into those sites that crawl RSS feeds for news.
Movable Type, by default, supports pinging two weblog update notification sites. To activate those in your Blog Config preferences check the boxes to notify blo.gs and weblogs.com. Weblogs.com is a site that tracks and displays links to recently changed weblogs and news-oriented web sites.
When you enable this feature, Movable Type sends out an XML-RPC ping (i.e. http://ping.blo.gs/ and http://rpc.weblogs.com/RPC2). When these sites receives your ping, they will check your blog to determine if it has changed since the last check; if it has, your site will be marked as updated. These systems will schedule an immediate refresh of your site so that they offer the most up-to-date version of your RSS feed.
In addition to weblogs.com and blo.gs, there are other services that support the XML-RPC ping interface and provide similar functionality. You can ping these either manually or automaticaly. These include:
Other blogging software that supports pinging include Radio Userland, blosxum, pMachine, and WordPress.
http://api.my.yahoo.com/rss/ping?u=http://www.yoursite.com/blog [GET http protocol]
http://api.technorati.com/search?query=%22your+search+terms%22&key=your_API_key&start=1 [GET; POST]