Looks like there's a bug in the Acquia Marina Theme. If I have all the blocks on the right then the green banners and white boxes don't work. A single block on the left makes both sides work.
I've applied the new Acquia Marina theme to the site. It looks good but looks better in the preview picture:
<img src="/images/acquia_marina.thumbnail.png" alt="Drupal Acquia Marina Thumbnail"/>
I can't work out where the white boxes with the green title bars surrounding the blocks have gone. Firebug is telling me that they are being overridden but that's not something to look at tonight!
I've been playing about with Drupal themes to see where I can drop ads. The colours leave a lot to be desired but I think that the layout is better. Will see what it looks like on a few different screens as I've only got my 12" Powerbook screen where I'm sat..
I've re-created http://mobile.garan.org/ so that it looks okay on a PDA/phone browser. It's just the central content of this page without the side bars and is based on the http://drupal.org/project/zen theme. Zen is meant to be a good theme to use as a starting block for building my own theme.. Just need some time.