I've always liked the skyscraper variation of sudoku. There have always been smaller "jigsaw skyscraper" type puzzles, particularly in some European magazines, but these always feel more like skyscraper puzzles than sudoku (of course, as jigsaws, they just use a latin square concept - so calling them sudoku is probably a big stretch).
However, the one 9x9 sudoku-style skyscraper I did was one of my favorite puzzles in recent memory. You can find it in the set of puzzles from Japan that Ed Pegg links to in his
Sudoku Variations article (search Skyscraper Number Place - its about 3/4ths down the page).
Anyway, thanks pyrrhon for this puzzle. I will definitely try it out.
Thomas Snyder