Excellent Dungeon Maps

There are a few tidy little dungeon mapping software tools out there online, but none of them were quite what I needed for my simple little Castle Meatgrinder Maps.  With a limited tile set available, I needed something digital that would allow me to drop them in place and rotate them as needed.  It also needed to be a program that let me customize simple icons for my dungeon dressing locations, and maybe drop in some notes to self as well.

 Here's a neat little post discovered while goofing off at work - on my lunch hour, the length of which we won't discuss.  Pretend Heroes shows the world how to use Excel to create simple, but information dense dungeon maps using everybody's favorite spreadsheet software, Excel.

First thing I did was build a suite of my rooms in one worksheet...

...and then drop them into a second worksheet with corridors, furniture, and notes.

That's all I need, and I can throw them together at work any time things get light.  Even better, by copying and pasting one level into a new worksheet, I can ensure that linkages between levels (stairs, pits, etc.) are accurate.

Anybody have any experience doing things this way?