I’ll take some today/tonight, I wanted to start off a “show off your UI” thread but screenshots are good too 
. I’ve got some really old ones in my Photobucket but other than that I lost all of my screenshots from before I upgraded to Vista.
EDIT:
Ok, as I said, I’ve raided my photobucket and found some REALLY old stuff. I’m talking about first trips into MC, my pally wearing a dress, ETC. Fun times, fun times. Anyways, here you go:
Garr got Greenched from past-Christmas’s ago! ;D
Here’s one just showing off my UI (god I was such a noob then 
)
Hey look, Ony’s dead! Haha, so old but good times.
Kurinnaxx down in AQ20, first day it opened. Lol, I was first Paladin on Bronzebeard to get the Blessing of Might book.
Hey look, Hakkar! Hiiiii Hakkar, just showing the UI as well as the timers for my old guild.
More of the same as earlier, I think earlier in the fight.
Hey look, more screens showing more addons. I think I was showing other Paladins HolyHope to be honest, lol. Hey look, my girlfriend Company 
.
UGLY FACE BUG IS UUUUUUGLY (female character, btw)
NO ONE TOUCHES MR. WIGGLES, or at least my mount said so.
New guild, top guild on the server at one point . We eventually were able to down Rag before sons. /woo *edited* FR gear though =/.
Its tiny but look at the combat log. From one of our first “hey, lets see what happens when we do this” on C’thun. Almost 1.4mill damage, 1.3mill resisted? No problem!
Hehe, I’ll get more later.
This is the only Naxx screenshot I ever uploaded to Photobucket since I was the first to post it on the forums and such . I wish I kept the rest /cry.