I have an existing website hosted on a private server for which I purchased the following domain - http://www.mcalhaney.com. I then setup a wordpress blog and in the cpanel on the other server set http://www.mcalhaney.com to redirect to my wordpress blog. I decided to cut out the middle man and go only with wordpress so I upgraded to the Domain Mapping feature for $13. I am something of a novice, but I thought that this meant that my wordpress site would be accessible via http://www.mcalhaney.com and mcalhaney.wordpress.com. This does not seem to be the case - http://www.mcalhaney.com is going to my old site on the old server and mcalhaney.wordpress.com does not work at all.
Blog url: http://mcalhaney.wordpress.com/