Digging through Google results yesterday, I came across
http://www.philipslogic.com/packaging/handbook/pdf/pkgchapter5.pdf , which
looks pretty nice for defining footprints.

Harold

>>Anyone have a favorite source for SMT land patterns? It
>>seems that every chip has a slightly different package
>>and I'm forever trying to figure out what the land
>>pattern should be.
>
> Find out what the jedec specs are for a given package. Almost every
> package
> is made to a given jedec shape, and should have a corresponding footprint.
> Look for an SO-xx or MS-xx type number on the package outline drawing, and
> work from there. The MS- numbers are Jedec, and the SO- numbers are the
> corresponding European organisation.
>

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