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If it does appear you were dropped (and that happens occasionally), waiting until the next update seems to be the most common recommendation. This assumes you aren't doing anything that might get you penalized, and that you have some external linkage to your site. Working on better linkage in your spare time (in lieu of answering the phone or packing orders...) would be a good thing regardless...
For a quick fix, there's Google AdWords and Overture...
9. I don’t appear in the new index, what did I do wrong?
Remember it's their database and they will do whatever they want to do.
Sorry but only Google can answer that question, they don’t remove you from the index without a reason, your site may have been down during spidering, or you did something that they didn’t like. Always review your site very carefully, is there anything that the normal user don’t see but the expert see (html code). Think what you have done to optimize your site, and see if you feel it’s legitimate. Also contact your webhost provider and see if they had some downtime on there servers.
10. I have lost positions on www2 and www3, what should I do?
It's normal to lose or gain positions when the update comes. Brett's Successful Site in 12 Months with Google Alone thread [webmasterworld.com] is a good place to learn about