You will have to do a query in your php page in order to get the latest posts. You can go find a modification that does the latest posts and just use the same query and templates to spit out the information on your page. You'll need to include global.php, just do it like this:
PHP Code:
chdir('/path/to/your/forums');
require_once('./global.php');
As for creating another page, this should help -
[How-To] vBulletin API Basics: Creating Custom Pages & Misc.