Does TELUS' "Unlimited Mobile Browsing" really mean unlimited?

[Ash B]

I just got the Student 35 plan at Telus, and it comes with "Unlimited web browsing". The note at the bottom of the page with the subscript says - "Unlimited Web browsing applies to PCS phones only and applies to usage within the phone's Web browser. Tethered usage is not included. Downloads and application fees are charged separately where applicable. Web browsing is only available on digital phones in TELUS digital service area."

Does this mean that as long as I stay away from Youtube and other downloading data sites, then I'll be perfectly fine and not have any overusage? Or do pictures on a site count as something they can charge as a download?

Finally, I don't see any restrictions as to what sites I can visit. Does that mean I'm in the clear?