Quote by Tony: First lets fix your terminology. Plugins extend the functionality of Geeklog. There is a plugin for Geeklog to implement forums (get latest from http://www.portalparts.com). There is also a 'hack' that integrates Gallery into Geeklog. I call it a 'hack' because it doesn't implement the plugin API but, I do use it myself and it works quite well.
Blocks, on the other hand, are the widgets you see typically on the left and right hand side of Geeklog pages. Some plugins include blocks of their own, some you can create yourself.
HTH,
--Tony
Thanks, sorry my post was unclear, I think I understood in my mind but didn't express it well enough. I've got most of it sorted now, bar a little problem with the Gallery, but I think that will just take a little more reading!