How do I reinstall apps after doing a clean install on my MBP?

My 2009 MacbookPro is running slow and crashing every now and then so I want to do a complete erase and reinstall of the OS. I am running Snow Leopard but will probably upgrade to Lion afterwards but not until I have everything back up and running properly again.I have my TimeMachine backup and also have a second copy of the folders and files I will want to restore onto the clean system. I don't want to simply restore everything again from TimeMachine as that will probably just bring back all the icky stuff that was causing the slow down in the first place.
I have purchased some applications from the App store so they are currently showing "installed" instead of "Buy", so how do I reinstall them again to my fresh system? If I click on the button will it still download even though it says "installed", or if not, how do I do that?
thanks

Follow the instructions here > Downloading past purchases from the App Store, iBookstore, and iTunes Store

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How do I reinstall apps after doing a clean install on my MBP?

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