Wow, awesome designs! My favorite design of the bunch is "Got Horus?" People probably aren't going to know what Horus is, but it's a nice way to strike up a conversation.
"iFriends" and "Together we fear nothing" are really nice, but I'm not sure I'd wear a shirt like that in public(it would brand me an even bigger geek than I already am

. "Why did the Thoom cross Orga Camp?" has too many IC references, IMO.
Personally, I wouldn't mind getting any of the shirts, without the slogans. Perhaps you could throw in the word "MMORPG" so the shirts make a little more sense to strangers. I also agree with Xel that all of the shirts should have to url for clanlord.com.
Finally, my own design suggestion: Have a small "You have much to learn" image over the left breast pocket, along with the "Clan Lord" label and the url. On the back of the shirt, in big letters: "Remember to eat and sleep!"
-Lundar