Great wireframing app, I just miss the sketchy feeling...
Excellent choice for wireframing of web pages!
Once you get over the default Comic Sans font (which you can change), this is an excellent, quick tool to sketch/prototype the "feel" of a design (as opposed to the look of it in say in Photoshop).
nice design, a lot of UIs and it so easy lo use, I like it
Very nice applicaton
Very simple et powerfull - Adobe AIR application is very practical
Web-based, fast, intuitive and fully interactive.
These are all really hard to use online. This one only allows one mockup in the free version. Might as well buy MS Expression.