Ask YC: The site that let you mockup user flow / registration procedures?

I believe the mockup + workflow tool was: http://productplanner.com/.

I was looking for that one, thanks! Balsamiq looks nice too!

maybe it's this : http://www.balsamiq.com/

Although not what you're looking for it reminded me of a great tool I've used and seen a few times.

Quick and easy sequence diagrams. Love it

Ths one may evenbe better suited for me needs. Thanks!

personally I prefer to use photoshop...yes with Balsamiq you can do the thing in a few minutes to get a rough draft...but to me at least, it seems like the time you'd save on the draft, you'll lose in the coding process by not having a clear idea of what you are planning.

With photoshop you can get an exact idea of what you'll be doing. And the extra time spent on getting a good mockup, will be more than made up, when you actually start coding.

Paper and pencil?