You helped me with the first half of the game of course
Second half was gankfest 2011!
Rat, here is the guide from the NUMBER 1 Blitz, Doublelift
Blitzcrank
Get Sheen + tank items -> Triforce -> more tank items
My preference is MCrystal + 2 pots start -> Sheen + Boots1 -> HoG -> Mercs -> HoG -> Triforce -> Negatron -> BV -> Randuins -> Brutalizer -> Atmas
Do not get Manamune or any Tear-related item. Never build around his passive., only see it as an added bonus/
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You are a ganker and tanky dps with lots of CC. Don't play him unless you're good with skillshots. Hook is everything to him. Peel for teammates when the enemy team gets on your squishies. Make sure your ranged carry is always behind you, so that anyone who tries to get to them will have to go through PF + hook when they finally reach their destination, while taking massive damage from being surrounded. Hooking tanks and initiators such as Rammus away from the fight is a good idea, as it effectively makes the fight a 4v5 for a short time. Generally, you'll be using your hook for catching farming/pushing/vulnerable enemies who are mispositioned. They'll be instantly blown up by your team, and you should take advantage of this buy pushing, forcing dragon or baron, jungle invasion, etc.
He uses armor pen reds, mana regen per level yellows, flat cdr blues, flat health quints. 0-9-21 masteries. Ghost/flash summoners. I personally like clairvoyance/flash on him because at my elo (~1300) no one ever takes it. However, if you have another person on the team that is going to take cv, let them take it and stick with ghost/flash.