A productive alternative to UML


I find UML hard to create quickly.
I'd like to put my ideas more quickly, especially for small open sourced projects.
If it was big enough I'd bother with UML but the project is too small for this kind of thing.
I don't want yet another tool that will make me think "nehh I'll do it later".
Any suggestions?

Best Solution

You could use a blog (WordPress is quick) or a mind map (here's one free on Sourceforge)