Yeah, the giant rules insert came with Legacy (And maybe mutant mayhem?)

I really don't know why it's not in the FF boosters too. It seems like a lot of people would have probably missed Giant Man and Steel.

yes, that does answer my question. thank you very much. so that means a giant fig can make a range attack or close combat attack to an enemy two squares away, even if there's a character directly between them.

From the WizKids site:
The answer is the same for giant-to-giant adjacency for team abilities.

i have another giant question:

what powers can you use to a giant, or by a giant, from two squares away? like, can you use defend on a giant from 2 squares? (i don't think so, but i want to make sure)

sorry, what i meant was support. can you use support from two squares away?

Based on the second question and hair10's answer in the post I quoted, I would say you have to be immediately adjacent to each other. I directly quoted PoPo's question on the judges forum and this was the response/quote I was given, and the response/quote mentions Support specifically.