This is a collection of placefiles that I have found to be useful or interesting.

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METAR

Iowa:  http://grlevel3.tornadocentral.com/metars.php?state=IA
Illinois:  http://grlevel3.tornadocentral.com/metars.php?state=IL
Missouri:  http://grlevel3.tornadocentral.com/metars.php?state=MO
Wisconsin:  http://grlevel3.tornadocentral.com/metars.php?state=WI
Minnesota:  http://grlevel3.tornadocentral.com/metars.php?state=MN
Nebraska:  http://grlevel3.tornadocentral.com/metars.php?state=NE
South Dakota:  http://grlevel3.tornadocentral.com/metars.php?state=SD

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Lightning (only available on ISU network)

15-minute lightning:  http://www.meteor.iastate.edu/~jpatton/lightning/ltn.placefile
60-minute lightning:  http://www.meteor.iastate.edu/~jpatton/lightning/ltnold.placefile

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SPC Products

County-based watches:  http://data4.michiganwxsystem.net/free/countywatch.txt
Mesoscale discussions:  http://grlevel3.tornadocentral.com/mcd.txt
Storm reports:  http://vansvault.org/weather/grlevelx/lsr.txt