Hello everyone, I currently am using a vertical format for my website, http://richmond-issued.com however, I would like to re-design and use a more horizontal format. I was wondering what the maximum width and height you all would recommend. Thanks in advance.

Its all really up to the web designer. I've seen some sites that were only 500 or so px high and a couple thousand wide, so you would have to scroll to see the different content. It just really depends on what your site looks like. each design I think has its own sizes that look well.

To go well with pretty much all resolution i think the best will be 800px width.
But you have to understand that these days people have around 19 to 24 screens size. And for that they have a bigger resolution.

There is no actual perfect size. But there IS a size that will please many people. See if now you have a 24inch screen for your PC you gonna have a HUGE resolution i donno, i don't have one but i am guessing around 1800x1000 something like that i guess well imagine a website with a 1800px width :/ first NO ONE has enough content to hold every corners of the site but more than that who ever has less than a 1800x1000 resolution will have to scroll the screen to see the entire site.

Now take it as if you have a 17screen and you run a resolution of 800x600 or around that ( i do not know the perfect scren resolution size) and you make your site 800px width well who ever is above you in resolution wich means people having more than a 17screen (more likely) they will see your site without scrolling.

All the sites i have made in the past and still these days are NOT bigger than a 1000px because thats what most people hold, and for who ever have a smaler screen and smaller resolution which is a very few people thant they will have to scroll.

I know that many many many people run around 1024x768, when i say many... is many, well i personaly never saw anyone lower than that, so its fine i guess. And gain if they have a bigger resolution than they will see your site perfectly.

But as trippin said above its really up to you... does your site need to be big ? small ? large... long ? its up to you, but to be nice to everyone i guess to not go over 1000px, at least not until a year or so when pretty much lots of people will Kill the 17inch monitor and have a 19minimum where they will use 1200x800 reso or better everyone has a 24

Or, alternatively, make it liquid - so that the width varies based on the width of the browser window. So, if you make it 90%, then on 800x600 it'll be approximately 720px wide, on 1440x900 it would be ~1300px wide. In that way, a maximum is no longer relevant.

This of course means you have to design it that way, a lot of layouts don't lend themselves to horizontal expansion.

oops i thought i did mention it, i did mention it on an other post, just like the Zymic forum its "liquid", its kind of hard to do for a site, well its easier if you use gradients.. but if its images... i donno, but its the best