Gary Moyers and Swade Moyers of Moyers Online highlight the Kramer VP728 Switcher/Scaler. The VP728 is a great solution for presenting multiple video sources...
HD Scaler Demo
Moyers Online | Kramer VP-728 Switcher/Scaler
Atlona HD video scaler
RGB Scart to VGA / SVGA /XVGA Scaler with SLG 3000