The PDF at http://www.umaine.edu/epscor/STEM/2011Maine%20STEM%20BrochureLR.pdf renders poorly for me - linux-64 on ubuntu 11.04 using nightly 4/23
Specifically, there is a bullet list on page one under the heading "This will be accomplished by focusing on the following objectives" which acroread renders the bullets as arrows, but pdf.js renders as some unknown glyph.
Also on page 1 under the text "I would like to be contacted about possibly
volunteering for the following" there should be a series of checkboxes (as shown by acroread) but its just whitespace in pdf.js
Works for me with current nightly.