The ODP search system has been suffering technical problems the past couple of months due to problems with the RDF data generation system - staff technicians are aware of this and have made it their highest priority and hope to have it fix as soon as they can (fingers are crossed and the odds are looking for for it be be fixed within the next 7 days). Normally the ODP search facility is updated on a weekly basis.
If you look at the bottom of the search results you'll see that "Search database last updated" time which is currently reading 28th September - if your site was added around or after this date, it will not show up until the next search database update.
