Amiable guide which gets straight to the point, I like it. Most info here I find valid (Masteries, Runes etc) although not sure about the teal text heh. I'd advice some use of BBCoding to be inserted ((Champion name/item/summoner spell etc) to do so I'll show an example below which will represent - Udyr when done so, just use square brackets.

= Udyr.

Items

Your build doesn't really have much armor and your going to end up rather squishy against the AD carry especially with his Greater Mark of Desolation and once he picks up Last Whisper. Force of Nature isn't really that cost efficient and against AP combo orientated champions like Sion & Brand, Banshee's Veil proves much more effective with its passive mechanics and the added health. You'll often see supports rush Aegis of the Legion first and on occasions picking up Zeke's Herald (as its now more a support item then for tanky champions as before) so you should include extra optional items in your build. I personally find Trinity Force a must later on (if winning) as your damage will be rather lack luster without it causing the enemy team to completely ignore you nullifying the point of getting Guardian Angel, all the stats benefit Udyr with a great passive effect and snare proc.

Randuin's Omen is a great item to pick up as it provides so much utility for your team in slowing the attack speed of the enemy ADs with its activation and passive which are both extra useful against attack speed oriented AD carries such as: Vayne with her Silver Bolts. Gives a chunk of health and armor.

Counter Jungling

Some mention of leaving a creep behind so that the respawn timer doesn't start and that by the time he comes back said camp you've killed has respawned, particularly the Wraith camp spawns back really fast. In general you won't to get the major jungle creep as that contains most of the gold and exp while leaving one of the minor creeps behind.