"Prototypes for Mac turns your flat mockup images into tappable and sharable prototypes that run on iPhone or iPod touch." Nice.

"How does it work? Just put your image size after our URL and you'll get a placeholder." Nifty!

"Over the past few months we’ve had to create a few iPhone mock ups for presentations... Since we know we’ll be doing more of this, we created our own Photoshop file that has a fairly comprehensive library of assets – all fully editable." Could be useful.

"Mockups feels like you are drawing, but it's digital, so you can tweak and rearrange controls easily, and the end result is much cleaner." Interesting-looking prototyping/wireframing tool.

An interesting series of concept images of what context-aware, mobile search and data-diving tools might look like. Some neat thinking around transparency and context.