well, yes and no…. how separate? 😉
basically you can serve different looking sites by styling your blog by parent page, or parent category and splitting it up thusly.
if you’re not really confident with php and templates and editing your theme, this will be a painful exercise for you – but DEFINITELY worth it, in my opinion, over running 4 copies of wordpress in the same space.
If you’re planning to ask “how?”, don’t. It’s a protracted discussion that depends a hell of a lot on what you want to achieve and the look you expect.
Instead, make this site your best friend: http://codex.wordpress.org/Main_Page
once you’re familiar with the basics, it will flow quite easily, you just have to grit your teeth and learn as much as you can about templating.
on the other hand, if the sites are entirely different and look NOTHING like each other, then you should probably consider giving them different domains, and running different copies of wordpress.
There _are_ different domains. 2 right now, and 2 more in the next 6 months.
But there is another issue;
The site that already has WP on it, I needs WP to handle everything in the site, not just the /blog/ directory.
You suggest I reconfigure _that_ copy of WP to support the whole site, yes?
Thanks for your help, Ivovic.
well if you have multiple domains, then a single copy of wordpress isn’t going to help you run them all very easily – wordpress mu might, but I don’t suggest it.
I absolutely do suggest that your site with wordpress installed already be configured to run the whole site, yes.
I think wordpress is a very flexible and powerful content management system, if you actually spend the time to code your templates properly.
Once the data is a post or a page, it’s up to you to extract it wherever you wish, which can be daunting for some, but offers incredible flexibility to all who sieze it.
Because of that, I’d suggest it should probably be the CMS on your other domains too, but alas, not a single install of it, no.