Today's collection of interesting/useful links :

1. Photo Mechanic on sale for $60](http://www.camerabits.com/site/15th_Anniversary_Release.html) - Great price for a fantastic app (Regular price is $150.00). I use it for downloading, renaming and selecting images before moving to lightroom. Saves a ton of time. Sale goes to the end of April. (Thanks [Caryn

2. Click the Squares](http://seawitchery.tumblr.com/post/4070384205/i-started-out-clicking-strategically-and-by-the) - Make some music, visually. (Thanks to [T

3. Postcards from Google Earth that Dali would enjoy

4. Visualising iPad interaction through fingerprints - Smudges on iPad glass after using various apps. This reminds me of another piece discussing how worn down numbers on door keypads make passcodes easier to guess.

Four Links For April 25 2011