A better introduction to Objective-C
This is an excellent tutorial, especially compared to the other one. The only thing I took issue with was this:    if ( [self hasPrefix:@"http://"] )
        return YES;
    else
        return NO;

The other thing that puzzled me a little was the K&R interfaces and Allman everything else, but I guess it's a consistent style. I do use K&R exclusively for blocks, so I suppose I am just as guilty.