When grouping with a druid let him/her know before the instance starts what role he will be needed for. Some druids are Feral (Warrior / Rogue hybrid) specialized, others are Restoration (Priest hybrid) specialized and yet others are Balance (Mage/Warlock ranged spell DPS hybrid) specialized and this can be a huge problem if you need him to be the main healer or tank/dps. The group will thank you if the druid knows what is needed of him.