This video will show you how to bypass websites that have blocked you by changing your MAC address, which will change your IP address. You can download now download it from this link: http://www.tinkernut.com/demos/205_mac/macmakeup195d.zip
If you use IM programs such as Yahoo Messenger or AOL Instant Messenger, this is a way that you can see if anyone has blocked you from seeing their status.
This video will show you how to set up an FTP server from behind a router using CrossFTP server (www.crossftp.com). If you need to find your main IP address, visit www.whatsmyip.org.