You can do this for any thumbnail that is displayed by entering a fixed value instead of the code that calls the size from the database.
so, take skin1/customer/main/cart.tpl
around line 22 ish, you will see the line that displays the thumbnail.
so where it says:
include file="product_thumbnail.tpl" productid=$products[product].productid image_x=
the bit that says:
image_x=
is the key
put a value right there e.g. 120
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