Beware of isubmit.com. This company has an offer of a 30 day free trial for submitting your website to search engines. The only way to sign up for this "free" trial is to give them your credit card information.
If you wish to cancel before the 30 days for any reason, they assure you your credit card will not be charged. I was not satisfied with the results, so I notified them before the 30 days were up to cancel my account. And of course, they went ahead and charged my card anyway.
When I disputed this, they assured me that they would credit my charge card account. This did not happen, and I just received my latest credit card statement and they charged me for an additional month.
They hide behind an e-mail address and a telephone answering machine. After my e-mails with them became more terse and threatening to take action, they asked me to e-mail them my phone number so they could call and discuss the problem. And, as you might guess, they never called.