I like your start (its very basic I know that), its got nice HTML I can read, and you've done okay in the syntax. I do have some comments though:
Use CSS for your document formatting. You can have a single style for your page, stored in a CSS file, and link it in each of your pages. This saves muching about having to set your fonts, colours and backgrounds each time. It won't do your template, you should use something like PHP to do that, which myself and others can give you pointers with. But as you have a free host, they probably don't give you PHP and other niceties.
When you put in a more complex layout, again, use CSS - Don't use tables. Tables are often abused like this, and your site won't look the same in every browser, it will have little annoying gaps in parts, and your code will be hard to read. Tables are fine if you need to show a table of something of course
Replace every '&' in your page with '&amp;', unless it's part of a special character reference, and make special characters use the special character references, not the raw character. Not everyone's special character set is the same as yours.
Weebl & Bob went to the park
Weebl &amp; Bob went to the park (correct)
<img src="/counter.php?digits=6&id=12345" alt="">
<img src="/counter.php?digits=6&amp;id=12345" alt="">
© 2004 Rule Brittannia.
&copy; 2004 Rule Brittannia.
Sometimes you can trigger browsers to display special characters without intending to if you use & rather than &amp;
You've got a </a> with no starting <a> tag in there:
<p align="center">Please ...[trimmed]... the guestbook.</p>[b]</a>[/b]
All img's need alt tags, even if they are blank. In them, write what you think a text-to-speach program should say to a person who is blind or visually impaired. Leave it blank if it's unimportant. Use the title attibute of images to do tooltips on images.
Set tell the browser what version of HTML you want to use. There's currently 3.2, 4.0, 4.01, and their varients (you'll probably want 'transitional/loose'), and also XHTML 1.0 and 1.1. Otherwise things have to guess.
As much as we like to think of it as one, PEEL isn't the official Futurama message board. It's just the biggest and most popular. FOX's legal department might pay you a visit thats all...
And here's some useful tools from the W3C
(the people who set all the standards and such for (X)HTML:Link checker
(finds dead links)HTML ValidatorCSS Validator
And I think thats it, and I wish you the best with your website