I'm very picky and probably try hundreds of new apps a year. I've wasted 10s of hours combing through crap, blah, and broken to get down to these tools. Despite the completely forgettable names, these are the few that don't piss me off:
- Cacoo: Wireframes. The interface reminds me of Gliffy but a little more stylized, hip. If Gliffy is Bill Gates then Cacoo is Steve Jobs.
- Color Schemer: Ready to go color schemes. It's better than agonizing for hours over color palates.
- Gliffy: Online version of visio. I assume this is named after some famous rapper or something. Bling bling bitches.
- Prezi: While it's interesting for presentations, I use it for doing architecture diagrams that are deeply nested. I would not object to gliffy and prezi hooking up and birthing a love child.
And that's it. Hopefully google indexes this and takes me to this page the next time I search for "that thing that makes diagrams on the web and is flashy". Index it!