I prefer ragged right edges most of the time because i hate uneven spacing - unless its done really really well - between words. Unevenness usually destroys the rhythm. I also find ragged right edges more interesting than pastural justified margins.
applet attached. i made a little helper applet called tracer that loads a .gif file and then outputs points that i click out, normalized to a particular point in the upper left hand corner of each glyph. i read the font descriptions in from a file and parse, compute, and draw the polygons each run() cycle. since the glyphs are not of the same width, i measure the letter spacing using a kerning value and the rectangle values of each polygon. multiple letters will wrap around.
i defined blur as vertical motion, moving the various polygons that comprise
each font glyph in accordance with the value entered. When
there are enough letters to wrap around, the blur becomes even more pronounced
since the letters obscure eachother when they animate. i find that .15 is an
optimum amount of blur.