Read the Linux + In Dept book along with running Fedora 7 (spent a lot of time in run level 3 vs. 5).
I also did an install of Cento5. I've been running Ubuntu on my laptop since last July.
My main (server computer) only have Ubuntu 8.04 now. Having Linux on to separate system helped me use NFS & Samba.
Yeah I'm nervous about Saturday. The TechNotes on Linux+ are good. I also watched Mike Myers Linux+ CBT.
The only reason I stopped studying for 70-291 is because last year around July I installed and ran Microsoft Vista Business for two weeks and was horrified by it. Let's be real 15GB just to install the OS, no really 20GB cause you need room for updates.

I thought to myself that there has got to be something other then a Microsoft Windows Operating or Apples OSX to use. I love Apple but I didn't want to buy another system at the time. So while at work I saw an old red box the said "Redhat" on it. I spoke the senior DBA about what the hell RedHat was. The night I downloaded
Ubuntu Linux and the love affair began. After twice weeks of studying I felt like blinders had been removed. I soon learned that everything I used XP for Ubuntu or Fedora could do.
I'm into ripping & burning stuff and with Windows if you delete large .iso, .avi your going to have to defragging your system all the time. In the past I'd schedule defrag a night so the computer would be left on all night. With Linux thats over. Using NFS to transfer files over 802.11g is faster between to Linux boxes then between two Windows boxes on my small network.
OS order (my opinion): Linux , Mac OS X , then Microsoft.
Distro's I like are Ubuntu, Fedora, CentOs, OpenSuse.
(Microsoft better watch out , because Ubuntu 8.04 is a Vista killer
http://www.ubuntu.com/products/whatisubuntu/desktopedition)
Well back to studying.

I'll let you guys know how I do hopefully I don't stress out and bomb it.