Go right now to Roles, Rules and Rolls and start downloading from the Rules and Tools section. Do it at once. Do not pass 'Go' and do not collect £200. Its contents are hands down the most useful of any RPG blog, anywhere.
A particular highlight for me is the PowerPoint Dungeon Mapper, which does in 2 PowerPoint slides what no piece of mapping software I have ever seen can do: create a good looking dungeon map with ease. (Don't be put off if your browser can't preview PowerPoint documents - just download it and enjoy.) And the innovation involved is seriously impressive: never in a million years would it have occurred to me to use PowerPoint for dungeon mapping, but it's perfect.
I can't recommend Roger's stuff highly enough.