Lion removes Front Row, but you can it bring it back using a package with genuine SL components put together by Ralph Perdomo. Download the package from http://www.mac-hatter.com/blog/frontrowenablerforlion. There you'll find some information and a download link.
Take into account, though, that after iTunes 10.4, integration between iTunes and Front Row is lost on Lion, although there are ways to bypass even this problem, such as an applescript that one Edumara put together in Apple Support Communities: https://discussions.apple.com/message/15833543#15833543.