Some gadgets I've built:
HaverCalc	Algebraic calculator, accepts times as input. Javascript.
Virtual keyboard	Surf the net when all you've got is a mouse. Javascript.
RandomNumber.net	A random number everyone can agree on. Perl.
RedPong	A simple pong-style game. Java applet.
MatrixMultiply	Multiply matrices, or raise a matrix to a power. Perl.
Reverse Boggle	Give it a list of words and it finds a Boggle board that contains them (it was an exercise in high-performance algorithm development). C++.
CharDist	Count how many of each character appear in a piece of text. Perl.
CRC Results Member Finder	Tool to scrape race results pages and find members of the Cambridge Running Club (use your cambridgerunning.org username and password). Perl, PHP.
Family Photos & Videos	Mostly our immediate family; some relatives and friends. Guided navigation implemented in Perl.
Havermath	Math problems for kindergarteners. PHP.
Some opinions of mine (old):
My Blog	On technology and politics
RemotePresence	Remote presence robots need faces and height
Who Governs Us?	Insights on the nature of government
1000 Things	Simplify your life by having less stuff
Random Thoughts	Metaphysical insights, product ideas, etc.
Links	Some links I use or otherwise found interesting
Personal / Special Interest:
Family Videos	Password protected.
Cambridge Comedy Clobberative	Members area -- password protected.
Small Government Act	To End the Income Tax in Massachusetts (sometimes erroneously attributed as the Coalition for Small Government)
BillHees.org	My old Cambridge City Council campaign website
Libertarian Party of Massachusetts	More politics
Things I Occasionally Need:
Levine	My current read.
CCCC Character Form	A form I need to print occasionally
HomeSearch.cgi	List of real estate sites, some parameterized for my Boston-area searches