Archive Thumbnail Gallery

I am trying to create a Archive page with a list of all my posts with thumbnail and a small excerpt underneath.

kind of like what this guys is doing

I actually followed his method and found out after some screwing around that he is calling thumbs with custom field thumb value

I was hoping to pull the thumbs from my featured thumbnails images as I dont want to go into every post and add a thumbnail.

so basically
1. Create a thumbnail list like u see in that dudes link
2. Be able to size the thumnbnails

Any thoughts, take in mind I am not a programming genous:)

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