There is zoom (fit to screen, 150%, 200%, 300% and actual size). You must select a section of the page using a moving rectangle, then click the joystick to zoom into that portion. Not ideal for fluid reading but it helps if small sections of text are otherwise too small to read.
Though you didn't ask, I know some folks are wondering and hoping there might be TOC support in PDFs, but alas there's no TOC or active links in PDFs .
-------------------- Lisa Gade Editor in Chief, MobileTechReview