// In the .m file of your TTTableViewDataSource implementation

- (void)tableViewDidLoadModel:(UITableView*)tableView {
    // the model has loaded, and hence Core Data entities are populated
    NSManagedObjectContext* context = appDelegate.managedObjectContext;

    NSFetchRequest* fetchRequest = [[NSFetchRequest alloc] init];
    [fetchRequest setEntity:[NSEntityDescription entityForName:@"MyEntity" inManagedObjectContext:context]];
    // set a batch size to control memory footprint
    [fetchRequest setFetchBatchSize:25];

    NSSortDescriptor* nameDescriptor = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES];
    NSArray* sortDescriptors = [NSArray arrayWithObject:nameDescriptor];
    [fetchRequest setSortDescriptors:sortDescriptors];

    _resultsController = [[MyNSFetchedResultsController alloc] initWithFetchRequest:fetchRequest
                                                             managedObjectContext:context
                                                               sectionNameKeyPath:nil
                                                                        cacheName:@"YourCacheName"];

    NSError* error;
    if( ![_resultsController performFetch:&error] ) {
        // handle error
    }

    [nameDescriptor release];
    [fetchRequest release];
}

// override TTTableViewDataSource's method to return the cell TableItem we want - three20 will take care of returning the right cell
- (id)tableView:(UITableView*)tableView objectForRowAtIndexPath:(NSIndexPath*)indexPath {

    DBResource* managedObject = (DBResource*)[_resultsController objectAtIndexPath:indexPath];

    TTTableItem* item = [TTTableItem itemWithText:managedObject.name
                                              URL:@"tt://foo"]; // set the URL you need to

    return item;
}