Awesome guide, great job +1
check out my recently published Brand guide :)
http://www.mobafire.com/league-of-legends/build/brand-setting-people-on-fire-244616

Not a bad guide, but could definetley use some improvements.
Runes
Fore every guide, it is customary for their to be a section about why you chose the runes you do as well as alternative runes as well if you don't have those runes. For example, I am not very fond of Greater Quintessence of Gold and normally use Greater Quintessence of Armor or Greater Quintessence of Ability Power to help with my damage output in a gank or bulk.
Items
This is basically the same as runes, as well as some fixes with Randuin's Omen and Banshee's Veil in terms of BB coding. You want to have some additional items that could replace the items in your build, what to replace, and why. By doing this, the viewers of your guide wil still be able to follow their play styles while getting your general build. Some items that I like a lot on Nunu & Willump are Abyssal Mask and Frozen Heart.
Skills
With skills, you want to give a description as to what they do and how to use them correctly. As a short example, lets say I was describing Consume
Consume is a spell where Nunu & Willump's yeti takes a large bite out of a minionn or neutral monster dealing 500/600/700/800/900 true damage and healing 125/180/235/290/345(+100% of ability power) of Nunu & Willump's health.
Tips and Tricks:
Use this in the jungle whenever possible as it is the majority of your damage and sustain in the early phases of the game
While running away, activating Blood Boil and using Consume could get you some extra health and then you can have a better chance of escaping, even if the enemy is a bit closer. Don't do this is the enemy has a gap closer or a stun/snare.
In an engage, you can fool the enemy into thinking that you are low and then Consume to gain an advantage and overcome them.
Consume is most effective on the largest jungle creeps such as the biggest wraith because even if you don't kill a jungle monster, it still heals you.
At the start of the game, Consume will kill the biggest wraith in one use, allowing you to take it and get out, most likely without being noticed.

Just want to point out a two things: when I described Consume, I basically used the description given by the website and just added a little bit such as BB coding or color and the name of Nunu & Willump and Consume and that this isn't the neatest way to put it, as the picture for Consume is only indenting part of the text. Otherwise, this is a pretty good guide overall, +1 and turn on comment to vote to prevent those troll voters.

Really nice guide I haven't tried it out but it has showed me what to expect from a Nunu jungler so it will help me alot when i'm off jungeling. I might aswell try Nunu jungle just because of this awesome guide thank you so much and keep playing them Gaimz!

ExP Darner

Yeah I meant to put a part about that thank you I will go in and add that =D. I some times do too mainly if I want a more quick clear if not then i go with the ice blast just to get an early gank

Pretty good guide although I usually get "w" second because it helps you clear the jungle faster.