SlopeDemo is a project mainly written in JAVASCRIPT and ACTIONSCRIPT, it's free.
A demonstration of using sloped tiles in Flixel.
This is a Demo I put together to demonstrate FlxTilemapExt, a Flixel Tilemap class that supports sloped tiles and one-way "cloud" tiles.
The class is largely based on earlier versions by Dirk Bunk and several other people.