If you host a site, blog or wiki (basically anything online) that has images, your page may tend to load slowly. Why? Because you've probably embeded files directly from your cameras SD card. Those files can be absolutely huge in size.
Enter JPEGmini. Very simply you can upload any jpeg file and JPEGmini mini will reduce the file size without damaging resolution or reducing the files dimensions. Sign up for a free account and you will be able to upload files to albums and download images or export directly to Flickr or Picasa. You can also connect your Facebook and Google accounts. The only caveat is JPEGmini only holds you images for a week.
Now when you upload your files to the web and embed them to your site, viewers won't have to wait so long for your files to load!