Join Date: Nov 2007
Location: Boston, MA
Bikes: '07 IRO Mark V, '01 Cannondale Jekyll 3000, '07 Rivendell Atlantis
+1 no suspension. On the road you really don't need it, it adds weight and maintenance to your commuter which ideally should be your simplest and easiest to maintain bike. Maybe slap some fatter tires on it (700x32 or 35) which will have a more appreciable affect than the suspension for the majority of the time (and will also keep your wheels in better shape).
Keep an eye on the spoke tension on the wheels too they'll loosen up more with disks and while they may not rub on rim brakes they'll go out of true and be weaker for it if not maintained.
2009 Bike Friday Season Tikit (commuting folder)
2007 Rivendell Atlantis (touring, general riding, errand runner, stuff hauler)
2007 IRO Mark V (SS)
2006 Rockhopper Comp Disc (Icebike)