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Like others here, I use DEVONthink Pro Office as my store of reference material. You can easily copy a link to any note or document and paste that link into the notes field of OmniFocus. A nice touch is that if you have that same note/document synced into DEVONthink To Go (on your iOS device), the links still work on your mobile device!

Just a note that while DEVONthink is fantastic on the Mac, the iOS app (DEVONthink To Go) is pretty sad--like someone said above, is basically only useful as a reader for stuff that you need to sync to your mobile.