Any idea?
The Sandman covers, as well as a bit of input on the actual issue (which ones? I have vague memories of hearing he was involved in Endless Nights).
And something out of Violent Cases, I think.
And, as I almost forgot, Mirrormask.
But, back on track, what's the full count?

1987: Violent Cases, The Prophet Who Came To Dinner (from Outrageous Tales From The Old Testament
1988: Began Sandman covers (lasted through entire run), Black Orchid
1989: MrX: Heartsprings and Watchstops, Signal To Noise, Luther's Villanelle
1990: Hold Me (Hellblazer), Vier Mauern
1991: cover to Neil co-written Comic Relief Comic
1993: cover to Angels & Visitations, covers to Death, Wordsworth (Hellraiser)
1994: Last Temptation covers, Mr. Punch
1995: Cover and music for Warning Contains Language
1996: Cover to Neverwhere, beginning credits to Neverwhere miniseries, covers to second Death miniseries
1997: The Day I Swapped My Dad For Two Goldfish, The Last Sandman Story (from Dustcovers)
2002: Cover and art for Coraline
2003: Wolves In The Walls, cover for Endless Nights
2005: Mirrormask film, Alchemy of Mirrormask book, Mirrormask children's book
2008: Cover for Graveyard Book

Plus some covers to things Neil was in