Some folks ping weblogs.com when they update their sites. (I do.) Some folks ping blo.gs when they update their sites. (I do.) Why do I ping them? Well, mainly so my #1 favorite blog tool (blogrolling.com) will know when my site is all warm & toasty fresh.
In your "weblog config" under "Publicity / Remote Interfaces / TrackBack" add in http://rpc.blogrolling.com/pinger/ in the text box and save your settings.
Why would you ping Blogrolling.com directly? First, your guaranteed that information is getting there as quickly as possible. Second, you can skip the "middleman", if you feel so inclined.