I'm starting to archive all of my photos for use in the future on the web, digital frames, PDAs, etc. and am puzzled by which format I should use for my "master files." TIF is the obvious choice....but large of course. So, I'm looking at PNG which is also lossless and offers better compression. All of the latest software releases support it (PS,IE,Netscape,ACDSee, etc.), so I think it's the right choice. Am I missing something? Is there a reason I shouldn't use PNG? Thanks.