For my IxD homies out there:Â A couple of online tools worth evaluating:
Rapid Rabbit
Rapid prototyping tool which allows you to diagram and create links between pages or dialogs (depending on what you are doing!). Seems good for high-level design planning and fundamental screen interactions and workflow — but I haven’t test driven this yet.
Pencil Project
Free and Open Sketching/Prototyping plug-in for Firefox. This one I *just* installed and plan to do a little monkey bidness with it. I mean, good monkey bidness. Ah, you know what I mean. Either way, it has stencils that are stylized specifically for Windows XP/Vista and GTK+ environs… it’s not to say you couldn’t prototype with this tool for web applications, but I’d wager there are other tools that work better for mocking up web application UIs.
For me, I still heart visio stencils from www.guuui.com.