NSData *data = [NSData dataWithBytes:(const void *)buf length:len];
                NSLog(@"DATA: %s", [data bytes]);
                NSString *tmp = [[[NSString alloc] initWithBytes:buf length:len encoding:NSASCIIStringEncoding] autorelease];
                NSLog(@"TMP: %@", tmp);
                toProcess = [toProcess stringByAppendingString:tmp];
                NSLog(@"toProcess: %@", toProcess);
                if ([toProcess hasSuffix:@"}"]) {
                    NSLog(@"LINE: %@", toProcess);
                    toProcess = nil;
                }


Results in:
(...)
11-06-04 14:26:27.710 GeeMtGoxTracker[90438:707] DATA: "
2011-06-04 14:26:27.743 Test[90438:707] TMP: "
2011-06-04 14:26:27.771 Test[90438:707] toProcess: 
2011-06-04 14:26:27.865 Test[90438:707] DATA: }
2011-06-04 14:26:27.907 Test[90438:707] TMP: }
2011-06-04 14:26:27.932 Test[90438:707] toProcess: 
2011-06-04 14:26:28.004 Test[90438:707] LINE: