Any app that makes my life (or rather, email reading) more simplistic is something I welcome with open hands. Show Me The Images was updated today to v1.3.42, which now brings official support for BlackBerry 7.
I've unofficially use the app on my 9900 for the last few months without any issues, so it's great to see them officially update it so that everyone knows it's safe to use with their BlackBerry 7 devices.
Show Me The Images automatically downloads images in your e-mails without you needing to hit that "Get Images" menu item. You can disable it, download based on a safe list of e-mail addresses (default) or download no matter who the contact is.