I added a new feature called "Deja Vu".  When turned on, the choice of color for words will become arbitrary rather than random.

Come again?

For the sake of argument let's say the color depends on a floating-point parameter C from 0 to 1, inclusive.  The random number generator will generate a different value of C at each respin, hence the color changes.

With the Deja Vu option, however, the value C is a simple formula which only depends on the word and the Deja Vu value.  No matter how many time you respin, even if you restart Tagxedo, you'll get the same C (for the same word and the same dejavu value), and hence the same color.  Mind you, the resulting Tagxedo still looks random, because different words will get arbitrarily different C.

Okay, but what's that for?

It is useful for comparing similar texts.

Given the same Deja Vu value (and the same theme), "Harry" in the Sorcerer's Stone will have the same color as "Harry" in the "Deathly Hallow".  "Government" in George Washington's Inaugural Address will have the same color as "Government" in Obama's.  You get the idea.

In other words, this very minor feature makes similar texts much more comparable visually.

Let's take a look at these four Inaugural Addresses (George Washington, Thomas Jefferson, George W. Bush, and Barack Obama).  I chose the "Classic" cloud, the "Brightness Fall" theme, and the Duality font.  Look at the colors of the words.  Isn't it much easier to find corresponding words between the speeches?

(1) George Washington

(2) Thomas Jefferson

(3) George W. Bush

(4) Barack Obama

Actually not only the colors are consistent among the versions, but the "desired" positions of each word.

How to use it?

For now, you add "dejavu=<value>" to the query parameter.  For example:

http://www.tagxedo.com/app.html?dejavu=20

The value must be greater than zero.  In a future version, this option will be made available in the "Layout Options" menu.

This option is now available in the "Layout Options" menu.  Just choose any non-zero value to turn it on.

Enjoy!

P.S. If you are paying very close attention you'll find "Country" in some and "country" in others, and the colors are different.  This issue will be addressed in the next version.