just played a game with amumu, irelia, garen, karthus, and annie. i went 7-1-22 as amumu, with a final build of FoN, merc treads, thornmail, abyssal scepter, and warmogs. didn't have time for the rylai's.
i had philosophers and heart of gold for almost the entirety of the match, and it made a huge difference. i'm not a great farmer as most of you know, but amumu's AoE damage abilities make it really easy to chew through waves of creeps. i laned and roamed with karthus and annie (hence the scepter), and by the end of the game i was able to sit in a teamfight and take virtually no damage when focused. we aced them twice with no losses to our own under one of their turrets, and after my initiation and tower aggro we were able to just melt them almost instantly.
it was a good game on a day full of bad games =)
i also picked up udyr yesterday and went 4-4 with him on the day (with one of those losses involving me disconnecting at 4 minutes thanks to client issues). in the losses, we got pushed hard early and lost several towers before 20 minutes, minimizing my effectiveness ganking. in the games where we were able to hold towers for a reasonable amount of time (as in, solo top didn't suck), i went 2-6-15 (primary tank) and 7-2-8 (offtank).
he's such a great bruiser, able to wade in, stun everything, deal some crazy damage with tiger and phoenix stance, and then get out and heal up almost instantly with turtle. as i'm getting the hang of his abilities, i'm really learning how to build him in different situations, and i'm liking it. he's got so much versatility in the jungle, too - he can start with regrowth pennant, longsword, vampiric scepter, cloth armor, or dagger and be totally comfortable. i still need to try him in lane from level 1 as either melee DPS or tank (likely tank, since i'm terrible at judging timings in-lane for a melee DPS character), but either way he still winds up being an awesome ganker, has excellent staying power in the lane from turtle, and is easily able to chase anyone in the game, ghost or not.