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The site needs to be crawled before the next update for it to be indexed.. The crawling needs to happen several weeks before the update as well. If you have a few decent incoming links, you should find yourself indexed next update :-) Keep checking Google to see if the freshbot picks up on you during the month as it usually will show your site for a day or so in there just after it's crawled it.
It should be indexed next update permanently (at least for that month). Until then, you'll just have to wait.
I find that if you're constantly adding content and have good incoming links, you can still generate some considerable traffic during the waiting time.. This is also good to test your keywords, because you can change it and get a fairly quick idea of whether your changes worked or not.