OK, for my own interest, let's see how long a run we can get out of Steven Wilson appearing as a full band member on albums or EPs.
1989: Tarquin's Seaweed Farm (PT)
1990: Love, Death & Mussolini and The Nostalgia Factory (PT), Colours (No-Man)
1991: On The Sunday Of Life (PT), Days In The Trees (No-Man)
1992: Voyage 34 (PT)
1993: Up The Downstair (PT), Loveblows & Lovecries (No-Man)
1994: Moonloop and Staircase Infinities (PT), Flowermouth (No-Man)
1995: The Sky Moves Sideways (PT)
1996: Signify (PT), Incredible Expanding Mindfuck (IEM), Wild Opera (No-Man)
1997: Insignificance (PT)
1998: Metanoia (PT), I (Bass Communion)
1999: Stupid Dream (PT), An Escalator To Christmas (IEM), II (Bass Communion)
2000: Lightbulb Sun (PT)
2001: Recordings (PT), Arcadia Son and IEM Have Come For Your Children (IEM), III (Bass Communion), Returning Jesus (No-Man)
2002: In Absentia (PT)
2003: Futile (PT), Together We're Stranger (No-Man)
2004: Blackfield (Blackfield), Ghosts On Magnetic Tape and Vajrayana (Bass Communion), Unreleased Electronic Music, Vol. 1 (solo)
2005: Deadwing (PT), Indicates Void and Dronework (Bass Communion), Continuum I (Continuum)
2006: Loss (Bass Communion)
2007: Fear Of A Blank Planet and Nil Recurring (PT), Blackfield II (Blackfield), Continuum II (Continuum)
2008: Pacific Codex and Molotov & Haze (Bass Communion), Insurgentes (solo), Schoolyard Ghosts (No-Man)
Scarily, this is incomplete. I know there's stuff missing (like the Bass Communion vs Muslimgauze releases), it doesn't include his work as a producer, some EPs for minor projects are probably not there, it's not counting live albums ... good god, Steven Wilson is a fucking robot.