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This is how I do it. This is asynchronous so it will not tie up the main thread.

.h file

NSURLConnection *connection;
NSMutableData* data;
UIImage *image;
YourParentViewController *myParentController ;

-(void)startDownload:(NSString *)url withParentController:(YourParentViewController *)parent;

@property (nonatomic, retain) NSURLConnection *connection;
@property (nonatomic, retain) NSMutableData* data;
@property (nonatomic, retain)UIImage *image;
@property (nonatomic, retain) YourParentViewController *myParentController;

.m file

-(void)startDownload:(NSString *)url withParentController:(YourParentViewController *)parent{
    [self setMyParentViewController:parent];
    NSURLRequest* request = [NSURLRequest requestWithURL:[NSURL URLWithString:url] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60];
    connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];		
}

- (void)connection:(NSURLConnection *)theConnection didReceiveData:(NSData *)incrementalData {
    if (data==nil) data = [[NSMutableData alloc] initWithCapacity:2048];
    [data appendData:incrementalData];
}

- (void)connectionDidFinishLoading:(NSURLConnection*)theConnection {
    [self setImage: [UIImage initWithData:data]];
    [myParentController processImage:[self image]];
    data=nil;
}

you would probably want to put this code in its own object (called for example DownloadImage). then you can download the images like this:

-(void)downloadTwoImages{
    //Make this a property somewhere in your H file.
    if (! imagesArray) imagesArray=[[NSMutableArray alloc] init];
    [imagesArray removeAllObjects];

    DownloadImage *imageDownloader=[[[DownloadImage alloc] init] autorelease];
    [imageDownloader startDownload:@"http://yourdomain/image1.png" withParentController:self];
    [imageDownloader startDownload:@"http://yourdomain/image2.png" withParentController:self];
}


-(void) processImage:(UIImage *)image{
    [imagesArray addObject:image];
}