This would be a basic tanking guide for rammus.
For my playstyle - these are the things i would go for.
Some champs have have jungle versions.

Enjoy ..

KEEPING IT SHORT AND DIRECT TO THE POINT.

Rammus:

- It's a great chase/escape skill. Easily avoided by single target in a crowded space e.g minions and clash. Don't expect too much damage though.

- It has magic resist increase a great tool for me in mid game against AP Champions. With the return damage, its great after-taunt against AD. Lets say you're chasing without , don't use Taunt-Curl use Taunt-PB. Some Rammus players still go for Taunt-Curl even in chase. Which i find stupid unless its a strong AD player who you're going with.

puncturing taunt - I can say this is a great saving,tanking,and killing-the-idiot-at-my-turret skill. Basically, you'd want to max this first, since you'll be using this the entire game , every single fights.

- Doesn't do enough damage for me, but it's one minute cool-down makes it great. Don't be shy to use this on minions, and especially turrets. It hits units and structures.

Amumu:

- A really good stunning skill to get ready for your . But also be aware, toss speed is slow, but the self pull is fast enough. Also it's hard to hit something with it if you're not familiar with it's speed.

- It's great with sunfire cape , especially during . You may also consider getting an if you love this skill so much. This ones great for jungling though.

- For me this is the second best skill of amumu. It does good damage and has a passive for armor. And it's Cool down reduces everytime you get hit, awesome right ? For a tank that is, if you're building AP amumu, that's not such a good thing ..
*troll types*
hold on, i wasn't finished .. the bad thing is the "getting hit" part, the cd reducts still good.

- AWESOME SKILL ! , if you're able to use this in the right time and place, you'd be a game changer. It's not all the time a question of who you stun, but how many. If the game is being carried lets say the opposing team has 21 teams kills and 17 of that is Katarinas or Fiddlesticks, you might want to think twice about the when and who.

Against Balanced Teams
Go for

Against AP teams
Go for Remove

Against AD teams
Remove

Amumu

Balanced Team:

i will add more tanks and jungle versions soon.

for now i'll drown myself on my girlfriends watermelons...