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plus of course you can use the typefaces you want, make pages that print easily, zoom in and out with one touch...
you can also make them load without anyone seeing acrobat toolbars - so it'll be a virtually seamless transition for visitors...
so amazed I am that rather than wasting my time trying to build something that's crossplatform, crossbrowser, crossversion perfect... I'm thinking of putting a link to Reader 7.0 on my multimedia site for language learners and then building the whole thing around PDFs. I reckon in the broadband era most people will stomach the download times and the advantages in presentational terms are enormous. Have I gone nuts or has anyone else beeen thinking down these lines?
Then the pdf file opens in the Adobe application (which on my computer would be full Acrobat, not just the Reader)
Also, depending on screen resolution and window size, pdf files often open to an odd percentage of their full size (like 147%, or 83%) which can give some very fuzzy looking fonts and pixelated images.
I'm not saying don't experiment - just know that your non-IE visitors may have some awkward usability to cope with, and even some IE visitors will not see things as nicely as you do on your system. PDFs were originally created for print, not screen - and in my view they are still mighty rough on screen. I have some applications that came with PDF Help Files, and I much prefer HTML.
So I'd say start small scale and watch the stats pretty closely.
Adobe Reader 7 is only available for Windows 2000 SP2, Windows XP and Mac OSX 10.2.2+. It is not available for Windows 2000 SP1 or lower, Windows 95, Windows 98, Windows Me, Windows NT, Mac OSX 10 & 10.1, Mac Classic, Unix or Linux.
You'd have greater compatibility with more users by developing a site for Internet Explorer for Windows version 6 only (and advertising your site as such). That would get you about 80% of the online population.
I've had a few clients expecting some of the advanced PDF form features to work on Mac and getting tripped up when their users view the PDFs using Preview--which works fine for all the basic features of the PDF, but ignores some of the more advanced ones.
And, due to the bloat of Acrobat, the availability of Acrobat alternatives and the increasing embedding of PDF readers in other applications, folks on other OSs might also have similar issues.
To add to what tedster said: a number of Acrobat's advanced features are designed for document exchange within the enterprise or an otherwise similarly committed community of readers. The target for PDF on the web in general is a more basic set of features.