I will add that version 7 is worlds ahead of version 6 in usability, both the Reader and Adobe Acrobat which I use for producing PDFs. Version 6 of Acrobat was awesomely crappy. It did things like break the perfectly-functional user interface for creating bookmarks in a PDF. It was pain to use it everytime.
Version 7 is still the biggest damn sack of bloat I have ever encountered for what is supposed to be a simple utility program.
Part of this is accounted for by the fact that Reader 7 is designed to interact with all the commenting and review features that Acrobat 7 Pro provides for the author. But still, 6 wasn’t that much smaller.
Reader has the only installer I have ever seen that appears to recompile itself for your system when installing. Seriously. Watch it when you install it. When you execute the install file, you get something called the FEAD 2.5 Optimiser running, which proceeds to ‘process’ Acrobat Reader 7, then the regular InstallShield-style installer starts. WTF?