Anyway, I previously listed a few things that were causing problems, and here's how they currently stand...
Authentication
Still causing the same problems. This is surmountable, so I'm not really concerned that much, but I imagine that anyone who's unwilling to use or uncomfortable with the command line who finds themselves in similar circumstances will have problems; making oneself connectible for the purposes of torrenting, for example, can only be done as root.
Firefox
All the problems I mentioned still exist. I'm using the official flash plugin and it's been updated via Adobe's own repo, but the problem with fullscreen video still exists. The .gifs are still borked, too.
Themes
k3b is still acting up with regard to the theme I'm using; however, it's been known to work on occasion. Most of the time, though, it's just ugly. I haven't really bothered looking at this at all, as it's fairly trivial.
Missing Packages
These have mostly been resolved through my own efforts; specifically, I was trying to load non-existent packages, and I've figured out where I was going wrong.
midentify, for example, is part of the mplayer-tools package, and mediainfo has to be got by downloading the RPMs; it was never in the repos. Still no sign of avidemux, though, and I'm loath to confuse things by downloading the source and compiling it. I'll wait a while longer.
Nvidia
A little research has led me to believe that it's the fact that I'm using a composite cable rather than VGA that's the source of my woes here; I still can't get native resolution, but I've managed to convince the driver to at least give me 1280x720. It's not perfect, but it's in the right ratio, so it'll do for now.
This was done by playing with xorg.conf; I tweaked the screen1 section (the TV) so that it looks like this...
Section "Screen" Identifier "Screen1" Device "Device1" Monitor "Monitor1" DefaultDepth 24 Option "TVStandard" "HD720P" Option "TVOutFormat" "COMPOSITE" Option "TwinView" "0" Option "metamodes" "TV: 1280x720 +0+0" SubSection "Display" Depth 24 EndSubSection EndSection
Unfortunately, using a VGA cable isn't an option at the moment.