Akora has posted a blog about Fire Resist Gear for Shamans that can be found here.
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IF YOU CAN'T STAND THE HEAT IN THE MC KITCHEN - PUT ON YOUR FIRE RESIST GEAR
When fighting Ragnaros, as a Shaman you willl need a minimum of 80 base fire resist (no totems that is cheating!) if you plan on staying in the back lines, 150 if you are healing the MT or MA, or are dumb enough to Melee him. Over 300 is needed if you are the Tank (another reason why we should not tank).
I personally try to keep my Fire Resistance around 80-150 at most times, and that seems to work for the lesser bosses. This works because we are not a front line unit, and are usually out range for most fire related damage. It is a fine line to walk between Intellect, Spirit and Fire Resistance (just like picking which Taruen Warrior to dine with on Friday nights), just strive for an overall balance. But for some boss fights swapping out normal gear for Fire Resist gear is a good idea.
The trash mob pulls (lava packs) before and after Baron Geddon (around Shazzrah & Sulfuron) it is a good idea to put on your fire resist gear that doesn't sacrifice too many other good stats. (Drakefire Shoulders & Amulet, that fire resist quest reward ring from killing MC bosses, etc) Just don't sell the Intellect and Stamina farm.
Most of the time I wear my "Elements" & ÃÅEarthfury" set pieces, but for tough boss fights you should consider donning some fire resistance gear. Fire Resist gear also drops in the MC too. Here are some Fire Resistance items for us Shammies that are obtainable with out a rock star level of effort (i.e. can be farmed outside the MC)
Helm - Sunblaze Coif it is a level 30 helm with ok stats that drops in SM, I got mine in the AH for 5 gold
Use: Just wear the Sunblaze Coif for the trash Fire mobs
Shoulders - Drakesfire Epaulets or Black Dragon Shoulders
The Drakesfire Epaulets give great stats and are red, the official color of the MC (bonus fashion points)
Use: Consider wearing the Drakesfire Epaulets all the time in the MC or for certain boss fights
Chest - Red or Black Dragon Scale breastplate (there is also a plain dragonscale breastplate that give good fire resistance and stamina)
Red Dragonscale Breastplate gives a nice bonus to healing, but requires 30 red dragon scales to craft it (i.e. rockstar level of effort)
Use: Consider wearing the Red Dragonscale Breastplate all the time in MC or for boss fights
Wrist - Pyremail Wristguards found in Black Rock Depths off of Lord Incinderous
The stats are one of those of random drop +10 to two stats or +15 to one stat
Use: if you got a set with Int or Spi stats consider wearing them all the time in the MC or for specific boss fights
Hands - Storm Gauntlets (Crafted) or Molten Fists found in BRD
The Storm Gauntlets have decent stats and the materials are not too bad to get either (Kernhoof can craft thesel)
Use: Consider wearing the Storm Gauntlets all the time in MC or for certain boss fights
Waist - Not much here, there is a leather +20 fire resist belt that drops in UD Strat. Or get the Earthfury Belt like me

The Firey Chain Girdle is great but very hard to get.
Legs - Searingscale Leggings in BRD, Black Dragonscale Leggings
The Searingscale Legging have nice stats
Use: Consider wearing them all the time in MC or for certain boss fights
Feet - Flamewalkers UBRS
Use: Just consider the Flamewalkers for the trash Fire mobs
Black Dragonscale boots give great fire resist, but you'll need an accomplished MC group to get the materials needed for these.
Shield - Draconian Deflector UBRS
Use: Consider using the Deflector all the time in MC or for certain boss fights. And be sure to tell Umu that you got this!
Rings - You can get a fire resist ring as a quest reward for five manning Ramstein in UD Strat You have to choose between a Int/Sta ring and a Fire Resist ring. I wish I took the fire resistance ring, because there are other equal or better Int. rings out there. Also there is a fire resist ring with INT & SPI from completing the quest line from Duke Hydroxis
Use: Consider the Ring for the boss fights or all the time. Or that silly key to UBRS also doubles as a +10 fire resist ring.
Necklaces - Drakesfire Amulet the Onyxia entrance quest, Elder Magus Pendant in DM West (the Pendant has great stats)
Use: Consider using the Drakesfire Amulet for certain boss fights
Use: the Elder Magus Pendant use all the time in the MC
Back - Wildfire Cape in UBRS, Cape of the Fire Salamander in BRD, or the Chromatic Cloak if you are into painful farming (or just date a farmer for awhile get the materials and dump him)
Use: Consider the Capes for specific boss fights, or the Chromatic Cloak all the time
Trinket - the Royal Seal of some unpronounceable name (damn Elves), aka the Shaman Trinket from finding the book ÃÅFrost Shock and You"
Use: I always wear mine all the time even outside of the MC it is a great trinket
Akora can take you to the DM Library to complete this quest, I know a trick that just takes 5 min. to get there.
1H Weapon - There is a mace that drops in UBRS the Masterwork Mace from AnvilCrack (haha I refused a blind date from this guy once), No stats just +10 Fire Resist and 37 dps
Use: Consider using the weapon for the trash Fire mobs
2H Weapon - Kindling Stave in BRD
Decent stats
Use: Consider using the weapon for the trash Fire mobs
Potions Fire Resist & Greater Fire Resist
Besides popping potions always makes you popular in the MC
Use: Consider using the potions for the boss fights.