Pro.
Unlimited uploads. (If you're photos are edited or HDR, panoramic, RAW etc, you'll need unlimited, it goes by MB's.)
WAY more group abilities.
Resolution abilities.
View, Favorites, Comments, graphs.
Reference links.
You'll get noticed more with a Pro and a free in my opinion, as well as more explore.
I have 3 in Explore right now, and they all happened after Pro.
You get some 10 free Moo Minicards when you sign up !!

It's like what, $25 a YEAR??
It's not that expensive. Just cut back 5 starbucks coffees for the week, you got enough.
This post was edited by TheBlackRose66 on Oct 16 2009 09:45pm