Pinayhosting offers free MySQL and PHP accounts with no ads. With the free account, you get 25MB of web space, 250MB data transfer (I assume it’s a monthly quota, it’s not indicated in the FAQs), Cpanel, htaccess and with no forced advertising.) The monthly quota isn’t enough to use the account for your blog. This, however, may be a good site for test accounts on PHP/MySQL scripts. I currently use free hosting accounts with 100 Webspace to try out WordPress themes, plugins and hacks as well as other PHP/MySQL scripts.