From the Wikipedia entry on dysgraphia:
Symptoms of dysgraphia
A mixture of upper/lower case letters, irregular letter sizes and shapes, unfinished letters, struggle to use writing as a communications tool, odd writing grip, many spelling mistakes (sometimes), pain when writing, decreased or increased speed of writing and copying, talks to self while writing, muscle spasms in the arm and shoulder (sometimes in the rest of the body), inability to flex (sometimes move) the arm (creating an L like shape), and general illegibility. Reluctance or refusal to complete writing tasks.
Pretty ironic, the "inability to flex (sometimes move) the arm (creating an L like shape)" symptom described above!
For more information about dysgraphia, visit the NINDS Dysgraphia Information Page at the website for the National Institute of Neurological Disorders and Stroke.