If all goes well, the new weblogs.com should automatically be 'pinged' when I save this entry, indicating latest update...

Yay, it worked! I simply execute the following command along with the MySQL INSERT statement (haven't yet figured out all that XML-RPC stuff):

$ping = file('http://newhome.weblogs.com/pingSiteForm?name=milov.nl&url=http://milov.nl/');