There's two basic strategies I use for WSG, AB and EOTS.

Each having a seperate healer with you makes a huge difference - if one of my friends isn't online I start advertising "quad box elemental shaman LF a healer to run some BGs with - I hit people for 50,000dmg, pst"

Warsong Gultch

I run this one like a foot ball game -- at the start of the game, everyone goes right and across the field - the two opposing sides usually pass each other on seperate sides of the middle.

For this, my healer and I go left to place ourselves right in front of the horde and road block them -- I drop totems, pop hero and the first person that's in range eats quad instant lava burst and drops. One of two things happens -- either the other team dismounts and we duke it out in which case I don't think I've ever lost, or they try to evade and run to the sides -- usually a few will do each so I kill whoever dismounts.

Once thats over I position myself just outside of our tunnel to get the flag carrier as he comes out (I'm also mounted) in case they come out the side -- I then chase down the flag carrier and return to my position. This is the best place to defend but also requires the rest of your team actively persues the flag, sadly I've a lot of games because the alliance just wants to watch me blow people up and no one gets the flag, but usually they're not retarded.

Arathi Basin -- Pop water walking on all shamans (I have a macro for this) and cast it on my healer -- we run through the stables and across the water into the black smith -- pop hero upon getting to the black smith because the horde usually zerg it so it may be 5v10 -- again, use instant lava burst to kill the first target to even the odds, I prefer killing a dps.

Once Black smith is secured, push to the farm -- this can be a little harder depending on respawns and where everyone else is but usually the horde is only defended by 3-4 horde and is easy to take -- once we have the farm we stay there and defend while keeping an eye on black smith -- if BS gets attacked my healer stays at farm and I run to BS to counter and then head back to the Farm -- defending the farm cuts off their access to the lumber mill and forces them to take the long way to get to the BS. It also seems to have a demoralizing effect on them since a conception is often if the other team holds your primary base they've won and your team must suck. =P

Eye of the Storm

I've recently modified my tactic, I previously just went straight to blood elf but I noticed that no one would capture dranei ruins, so now I run to blood elf until we have it capped and by that time the horde is usually on the bridge between the blood elf tower and dranaei ruins and we fight them on the bridge --- same rules apply as above, nuke the first person.

Once the bridge is dead I ghost wolf it to blood elf and thunder storm whoever is still there off -- drop totems, including my staggered tremor totems and set up shop -- at that point its like king of the hill and I can easily pick people off one at a time as they run up.

Once blood elf is secured I push fel rever but here's what I do slightly different - instead of running down the road straight to them where they'll see me and we may get intercepted and killed in the middle, I run around to the back (towards where the horde start out) -- when I had huge mounts I would ghost wolf for this to make myself as strealthy as possible, but I come up from behind fel rever and thunder storm its defenders off and then its like king of the heal again.

Once FR is taken I'm at close access to mage tower and blood elf and this usually results in a 3 or 4 cap.

Strand of the Ancients I hate this map, I really do -- winning usually depends on if we start off on defend or not. If we do I'll go to the front and then after the first wall is down I'll fall back to the last choke point -- with my 4 shamans and a healer, along with my fire elemental totems I can hold back the horde for the rest of the round. A lot of times if they can't take our base in the 10 minutes, a few of them will give up when its our turn to attack because at that point the most they can get, even if they also defend for 10 minutes is 1 badge and most would prefer to just let us win to get it over and into the next BG asap.

For when we're on the boat -- I usually will have 2 shamans on one boat, two on another -- I use my water walking macro and mount up - I look at what direction the other two are -- just before the two boats land at the docks I jump off and water walk across the water to pick up the other two -- the range on /follow is just enough that if I get right next to the boat, they'll follow and jump off and now we're all in the water - from there I get on the land and do my best to defend the seige engines.

Isle of Conquest Everyone goes for either docks of the work shop - I charge out the main gates and look to see where the majority of alliance are going - if they're going to the docs then I go to the work shop and visa versa -- immediately upon getting to either location I drop totems, pop hero and start nuking people down.

From there I'll either run with the seiges and defend them -- with pvp gloves the range on flame shock is 45 yards meaning they can reach the enemy cannons and kill them

I'm also a fan of going to the hanger, getting on the ship and jumping into the base (if you have a 3 person mount this is great, keeps the shamans togather) -- I run to the middle of their base, drop totems and start killing horde -- once they're dead I run bombs to the gates two at a time until we drop them. Once the gates are down and we're charging the boss, I drop totems by him, drop my earth elementals, pop hero and he's dead 10 seconds later and gg alliance wins.

Hope this helps!

-Clov