I was having some problems with my PDF sizing within the new Lion:
a Mini with factory installed Lion, and an external 3rd party disk driver.
I did not give enough Credit to the Staff here at IMSI for already fixing the problem before I knew about it.
When needing specific PDF's (large format) simply call up the advanced size options as needed, the file saving bar generates ( not as Lion did not within the Preview settings), and there it is right where you put it! here is a sample- note) some lines are white, so are now invisible)