which mac mini do you have? you can pretty much connect any monitor that is dvi or vga-- but you may need a $20 adapter. the only exception would be the apple displays which use the ADC connector (looks like DVI only with round edges). This approach would require a costly adapter, otherwise most monitors should work. Have you bought one/do you have one/what are you thinking of getting?
Me: 15" MBP 2.4 ghz / She: White MB: 2.4 ghz / Work: Dual 2.0 PowerMac G5 w/ 20" ACD / Home: Apple TV 40gb on Airtunes