I'm a bit late to the party here, but I want to add a few comments.
I used to give everything I found and couldn't use away to lower level players in the guild. I then discovered that one of the items I had given away was being sold on the AH. I had words with the person I gave it to, and it was handled, but it left me with a slightly bad taste in my mouth, especially as it was an item which would have benefitted several people.
There has been a bit of cliquey-ness developed, mainly because different people are progressing faster but that will change as more people progress to the same levels.
Now that I am level 60, my intention is to spend more of my time helping lower level players, although that is likely to be help with professions, as it is very hard to help with levelling up. Please let me know what you need.
As to further co-operation, I've noticed that players are selling items to each other at vendor prices and thats good to an extent. What I would like to see is people giving away items such as fabric (to players of similar levels!) to people who's professions use them. This will benefit you, as that high level tailor can then progress his skill and make stuff for you at cost. The guild currently does not have a high level tailor!
I believe we also have a 'Most Wanted' thread on here, so please edit your posts on that thread to what you currently need so that people who find items can get them to you.
We should also be using this forum more to arrange instances.
Please don't leave Allen! Help us make the guild into one which benefits all!