You can found aguide for every boss encounter but sometimes you would like to have some tips on the places inbetween bosses too. Like going through the maggot/eye stalk room leding up to Loatheb in Naxxramas.
For us, the by far most successful way has been to hug the wall at the same side as the entrance, let the tanks run first with rest of group close behind and not fight anything until we're on the other side. It's important that the tanks run first so they get most of the aggro and that others stick together behind.
If you have a warlock in group and access to some invisibility potions, the warlock and two other players can run unnoticed to the other side and summon the rest of the party.
It is also worth noting that it is possible to stealth through the room.