I frequently create SWF screencasts at home, embed them using PPT 2000, and
bring them to work for distribution.  They work fine.  The problem I have is
that on occasion I may edit the presentation using PPT2002 and when saving,
even w/different file name, file size increases dramatically.  This will
happen even if the change is to correct a typo on a text-only page.  I have
fast saves off, know about not embedding fonts., etc.  The increase is
dramatic - one recent file was 9.5 meg when created in 2000 and increased to
15+ meg when saved in 2002.

Further, I find that even if a create on original in 2002 the file size is
dramatically larger than if I do it in 2000.  For example, a completely blank
presentation with an embedded SWF of only 92k saves at about 400k in 2002,
less than 200k in 2000.  

I should mention that I only have this problem if the presentations contain
SWF's - other presentations are fine from version to version.

My workaround has been to do everything at home but now couple of others in
my office want to do the same thing I'm doing and they will only have 2002.  
I can't find anything specific to this problem and hope someone here has an
answer.