Nitro PDF Reader (64-bit)
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Full user review
"Warning: 64-bit download is actually 32-bit!"
Looks like a slick reader, even if it does have a dubious ribbon-style interface
download.cnet.com is the only place to download this reader (the Nitro PDF Reader even links back to here), so it's highly annoying that the 64-bit download is actually a 32-bit installer and application!
Nice reader, shame about the woefully wrong "bitness" of the packaging - no 64-bit version is available at the time of writing! I've reported it to download.cnet.com, so hopefully this will be fixed soon.