hey lostie
I agree on the logo 100 to 120 pixels for a header is sufficient.
A few minor points
No meta Description tag ?
No robots.txt , I like to provide a sitmap for search engines and place a link to it in the robots.
I will assume no robots no site map tut tut.
W3 validator handy for checking your code
[Invalid] Markup Validation of http://www.motley.ie/index.html - W3C Markup Validator
Image tag should have height and width <img src="images/header.gif" alt="Motley Magzine" id="centimg" />
Run a spell check.
c Motley Magazine 2007 , welcome to the new year.
On a 1024 resolution I have to scroll a little to the right to see the whole page.
Over all the site looks good a little bit of tidying and your away.
Good luck with it.