I'd install WordPress in hosting A (domainA.com), and, I have a domain in hosting B (domainB.com - not installed WordPress, just parked domain).
When access http://www.domainB.com/2007/03/24/2nd-post-1st-blog.html
user (not domain-redirected) show :
http://www.domainA.com/2007/03/24/2nd-post-1st-blog.html pages. (domainA.com installed WordPress).
For simple :
http://www.domainB.com/page.html => page.html domainA.com
Thanks for help.