These may already have been suggested, and I hate making people read walls of text.
so here is one:
Armor Preview -
http://i235.photobucket.com/albums/ee150/Mirokux1337x/ArmorPreview.png
Edit: forgot text. Because those menus only show when moused over, making so when its in your "shopping cart"
It previews the armor in a box. It could even be below or above the merchant art.
For multiple items in your cart, previews the latest one.

Guild Announcement Board -
http://i235.photobucket.com/albums/ee150/Mirokux1337x/Guildannouncmentbo...

Guild Mineral Deposits -
http://i235.photobucket.com/albums/ee150/Mirokux1337x/Guildsuggestion.png
derp... "inventive" should be "incentive" Typos ftl.

There are my suggestions, for what they are worth.