actually, i have the same problem.
of course uploading files to a site that already exists is instantly available, but the problem is adding subdomains, mysql databases, and email accounts.
i had added a subdomain thursday night, and it wasn't available until around 8:30 friday morning. i was ready with my pages an hour after "adding" the subdomain, but since it hadn't been created yet, even its ftp folder wasn't available. after i got impatient, i used telnet to get in to create the folder on my own.
perhaps i'm missing something, but don't these changes basically boil down to changing some configuration files and perhaps creating folders? are these changes being manually done?
ps- i'm still waiting on an email address that i created early this morning.