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Listhings (beta) – take sticky notes online.
I personally use Acrobat Pro to merge, split, and optimize my PDFs, but there are lots of free alternatives! A few were shared today by some great bloggers at App Storm. Check out some of these great alternatives:
Educational Games Research » The Top Journals for Video Game Research
Great ‘Read-Alouds’ From The New York Times – The Learning Network Blog – NYTimes.com
Pi Day Google Earth File
Pi History 1
Great Blog Post on Searching For Pi
Pi and Fibonacci Working Together
Pi to a million digits
The Joy of Pi
Full text of House Resolution 224
Full text of the Floor Debate, March 11, 2009