1) You cannot use the unsubscribed replay to watch any shows. If you have other Replays, or DVArchive you can watch the recorded shows on the unsubscribed unit.
2) Most of us would say the myreplaytv.com website is already nonfunctional. Most likely it would not work for your unsubscribed unit. If it is no longer calling home to the mothership, there will be nothing to see on the website.
3) Look at the TV guides on MSN to get you started looking for alternate online guides. You might also be interested in the new www.schedulesdirect.com data feeds.