I don't have a lot of time at the moment, so I'll make this brief; I finished this guide up last night dedicated to walking players through a speed run of .hack//Infection. It is not complete yet, as I'm still missing specifics on party members available for a few dungeons. I'll be going back through the game to figure this out within a few days at most. In the meantime, I want to see what people think of it and what should be changed. Not that I might actually change anything, but we'll see.
EDIT: Updated it with accurate character availability and hopefully added in the last monsters remaining unnoticed. Unless I make any last-minute fixes, if no one says anything by tomorrow, this is how it'll look when it's sent to G'FAQs.
EDIT 2: It's up. The link has been changed to point to the guide's permanent home.