Software - StringPort, Max/MSP/Jitter, Live, Logic, GarageBand, GuitarRig + other NI stuff, SuperCollider, Quartz Composer, Sooper Looper, and a few more have all been SoftStepped,
Hardware - StringPort, Roland VG99, VG-8, FC-300, Yamaha VL-70m, Apple i7 iMac + SoftSynths
OnLine resources - Wide net searches, but also sites such as CDM, SoS, GearSlutz etc that come up regularly . . .
KMI StringPort_1650, SoftStep_VK2 v1.2 & MIDI Expander; Mac_Moore Guitar,
Roland VG 8, 88 & 99, YamahaVL 70m; OSX 10.6.8, iMac i7 2.8G QC; MaxMSP 5.1.8, Ableton Live 8.2.2, M4L, SC3, QC, cSound, etc, etc,