Hello
Here is my 2 cents for what it is worth. :)
I like it overall! It looks great. The Marshall amp theme is an awsome idea.
Now for the few and I mean few, maybe even petty things. :p
I would add a bit more left margin on the content and reduce the top margin.
I would move the right column to the left a little to get the right column content off the image/amp border, and just make it look more uniform.
You could replace the site title with text and use CSS to place the header image there. Or use the same image just replace actual text with an image. http://www.pmob.co.uk/temp/headerreplacement3.htm
There are some validation errors that could be fixed. I mean it is no major deal but you might as well. Most of them seem to be with the RSS trackback code added below each post:
<!--
<?php trackback_rdf(); ?>
-->They seem to be missing the:
<!-- -- >Pretty simple to fix. :)
The other error is the header <img /> tag missing it's closing slash /
There may be more errors and warnings HTML Tidy stopped counting, so I am unsure. Fix the RSS deal and most will go away than we can see the rest.
As far as link color, maybe something a bit lighter than the orange maybe: #D0AB5D (copied from the amp head wood grain)
Though, like I say that could just be my tastes and pickiness. ;)
Thats pretty much it, like I say it looks great. Good job!!!
Hope my advice proves fruitfull.