http://discussions.apple.com/thread.jspa?threadID=1765684

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 
{
	
    [tableView deselectRowAtIndexPath:[tableView indexPathForSelectedRow] animated:NO];
	
	
	switch(indexPath.section)
	{
		case 0:
		{
			UITableViewCell *cell1 = [tableView cellForRowAtIndexPath:indexPath];
			UITableViewCell *cell2 = [tableView cellForRowAtIndexPath:oldIndexPath1];
			cell1.accessoryType = UITableViewCellAccessoryCheckmark;
			cell2.accessoryType = UITableViewCellAccessoryNone;
			oldIndexPath1 = indexPath;
			// Set model-object attribute associated with row
			break;
		}
		case 1:
		{
			UITableViewCell *cell3 = [tableView cellForRowAtIndexPath:indexPath];
			UITableViewCell *cell4 = [tableView cellForRowAtIndexPath:oldIndexPath2];
			cell3.accessoryType = UITableViewCellAccessoryCheckmark;
			cell4.accessoryType = UITableViewCellAccessoryNone;
			oldIndexPath2 = indexPath;
			// Set model-object attribute associated with row
			break;
		}
		case 2:
			// This one will push the view controller
			break;
		default:
			break;
	}
	[tableView reloadData];
}


http://www.iphonedevsdk.com/forum/iphone-sdk-development/7391-uitableviewcell-repeat-every-12-rows.html

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell;

    if (indexPath.section == 0 && indexPath.row == 0) {

    cell = [tableView dequeueReusableCellWithIdentifier:TextFieldCellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:TextFieldCellIdentifier] autorelease];
     // subclass a textfield for the first tableview cell
        UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(3, 3, cell.frame.size.width - 26, cell.frame.size.height - 7)];
        textField.autocorrectionType = UITextAutocorrectionTypeNo;
        textField.borderStyle = UITextBorderStyleRoundedRect;
        [cell.contentView addSubview:textField];
        [textField release];
     }
     // you need to set the text for the textField here 

    } else {
    cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
    }

         [cell setText:@"My text goes here"];
    }

    return cell;
}


http://discussions.apple.com/thread.jspa?threadID=1602915

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)newIndexPath {
 
    UITableViewCell *newCell = [tableView cellForRowAtIndexPath:newIndexPath];
    if (newCell.accessoryType == UITableViewCellAccessoryNone) {
        newCell.accessoryType = UITableViewCellAccessoryCheckmark;
        // Set model-object attribute associated with row
    }
 
oldIndexPath=newIndexPath;


    UITableViewCell *oldCell = [tableView cellForRowAtIndexPath:oldIndexPath];
    if (oldCell.accessoryType == UITableViewCellAccessoryCheckmark) {
        oldCell.accessoryType = UITableViewCellAccessoryNone;
        // Unset model-object attribute associated with row
    }
}

http://runtimebrowser.googlecode.com/svn-history/r40/trunk/iPhone/Classes/FrameworksController.m