Okay, so I have done a ton of research on this and have been pulling my hair out for days trying to figure out why the following code leaks:

[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
UIImage *comicImage = [self getCachedImage:[NSString stringWithFormat:@"%@%@%@",@"http://url/",comicNumber,@".png"]];
self.imageView = [[[UIImageView alloc] initWithImage:comicImage] autorelease];
[self.scrollView addSubview:self.imageView];
self.scrollView.contentSize = self.imageView.frame.size;
self.imageWidth = [NSString stringWithFormat:@"%f",imageView.frame.size.width];
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;

Both self.imageView and self.scrollView are @propety (nonatomic, retain) and released in my dealloc.. imageView isn't used anywhere else in the code. This code is also run in a thread off of the main thread. If I run this code on my device, it will quickly run out of memory if I continually load this view. However, I've found if I comment out the following line:

[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
UIImage *comicImage = [self getCachedImage:[NSString stringWithFormat:@"%@%@%@",@"http://url/",comicNumber,@".png"]];
self.imageView = [[[UIImageView alloc] initWithImage:comicImage] autorelease];
//[self.scrollView addSubview:self.imageView];
self.scrollView.contentSize = self.imageView.frame.size;
self.imageWidth = [NSString stringWithFormat:@"%f",imageView.frame.size.width];
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;

Memory usage becomes stable, no matter how many times I load the view. I have gone over everything I can think to see why this is leaking, but as far as I can tell I have all my releases straight. Can anyone see what I am missing?