I love helvetica so bad... and what gives it away for unprepared eyes is the capital R: one of the most beautiful letter in Helvetica.
Wow, very interesting! I like how you set up the comparison.
This is very usefull and good : D I just want helvetica to my computer, don't have it 8'( but I have arial.
Love this. I love how you overlapped the actual letters, so we could see the actual, physical difference. The layout is great, also.