I agree with Sachmo's points above. You don't need a new system to do what the forums/guides already allow in my opinion.
If you want a guild agenda type things. This seems to me like a good place and stuff to put a Guild Goals guide up for people to read and understand what the FOCUS and GOALS of the guild are.
For people that need help or an obvious over site that guild officers note it is very easy to make a post and say "There seem to be a lack of members raid ready for Karazhan. Please ensure your Key/Attunement status is updated on your profiles and post here if you are stuck at a step and in need of help".
On our site I created a tag specifically for making a post saying "Help Wanted". It has worked really well so far with our users that actually use all the tools available to them to get groups setup to get runs completed and keys done.
Also as far as gear goes. Each Character profile at the bottom has a section called Wanted Gear. Each player can go to each character they have and enter the gear they want here. This will let you see what Priest not only need the D3 shoulders but if they even want it.
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Six Demon BagJack Burton: Hey, what more can a guy ask for?
Egg Shen: Oh, a six-demon bag!
Jack Burton: Terrific, a six-demon bag. Sensational. What's in it, Egg?
Egg Shen: Wind, fire, all that kind of thing!