Gemmell was the author of the books Waylander, Legend, Wolf in Shadow, The Lion of Macedon, and most recently, Troy: Lord of the Silver Bow. I found his books when I was round fifteen, I think, and liked the simple, plain language they were written in, and the simple, plain violence they came with. There was a lot of repetition in his work--most of his characters were, in one shape or another, merely repetitions of characters from previous books. But every now and then he could rise above that, and it was always good to see. I had actually drifted out of reading his books for that reason, but ended up picking up Lord of the Silver Bow last year when i needed something light during thesis pain, and I really dug it. Gemmell had worked out a nice structure to the book, and he look set to do a good historical/fantasy series that would probably match some of his stronger earlier work, specifically The Lion of Macedon and its sequel Dark Prince, which were constructed around ancient Greek figures.
Anyhow, it's sad to hear this. He died after finishing the second book in his Troy saga, but not the third, since this was a rare planned trilogy for him.