Snarkmarket links to a very interesting On Language column and addendum about camel case. In addition to the idea that camel case has been popularized by programming languages (which makes sense), the following insight into the role of spaces between words caught my eye:
In Ireland and England during the seventh and eighth centuries, local priests had so much trouble with Latin that spaces were added to their liturgical texts as a crutch. Clerics discovered that reading became more fluent for everyone, because the eye can recognize separated words as distinctive shapes. Monks were able to copy manuscripts in silence, in accordance with many of their vows, and privacy intensified the experience of devotional reading. The innovation flourished and by the 13th century was standard in Latin everywhere. Angels in manuscript illustrations used to speak into the ears of scribes; now they presented them with books to read for themselves. Clerics tackled more complex texts, in greater numbers, and Saenger argues that silent reading seeded the flowering of medieval theology known as scholasticism.