I own a free hosting company, I was wondering if there was a way to add all of the free account URLS to google at once and automaticly when a new person signs up??
Then nothing. Google will see the link to your list page in this thread, and will crawl that page. Whatever sites it doesn't already know about, it will discover when it crawls your list page. It will put them in its queue, and crawl them.
No problem. You might want to gather a few more links to your list page, as some people believe those tell Google to check for updates more often, but otherwise you've already done everything you need to.
Well you put one in this thread. The page is really of little or no value to anyone who isn't listed on it, which makes it an ideal candidate for directory submittions. There's a forum here called "Submit to my directory" that has plenty of free advertising. Adding this page to a handful of directories would raise its importance in Google's eyes, which probably makes them crawl it more often and discover new sites you add more quickly.