Here's a guide to clans that is probably useless or something.

DM - Dark Mercenaries
Active members: FireSworD, DizZy, MaGoo, AvK, Spotty, EvilMike, FQuist
All members: FireSworD, DizZy, MaGoo, AvK, Spotty, EvilMike, FQuist, iCeD, WhiteFang, Syntax, Sprintman, VelKasha, others
Overall skill: Very high
Player activeness: Very high
Clan activeness: Very low
New member strictness: Very high
Has some of the best players on JJ2, it's players play a lot, but the clan itself doesn't do much in terms of wars and getting new players.

FoR - Fellowship of the Ring
Active members: TurtleSlayer (Turtle), JmaN, CelL
All members: TurtleSlayer, JmaN, Boarder, FireBall, CelL, RagE, some others
Overall skill: High
Player activeness: Low
Clan activeness: Very low
New member strictness: Medium / high
Has lots of great players, but not very active. Only one of the members plays regularly.

TF - Total Freaks
Active members: Unhit, Enigma, Dalspots, LAbRaTkiD, Thunder, Stilleto
All members: Unhit, Enigma, Dalspots, LAbRaTkiD, Thunder, Stilleto, Skulg, WhiteRabbit, Dopeh, Flash, some others
Overall skill: High
Player activeness: Medium / high
Clan activeness: Medium
New member strictness: Medium
Has lots of great players, fairly active, and does clanwars. Also plays JediKnight 2, JediKnight 3, and Warcraft 3, although only active in WC3 and JJ2.

GpW - Gurus of Proactive Warfare
Active members: ChavRash, SuperJazz, Gummi, Newspaz, Pyromanus
All members: ChavRash, SuperJazz, Gummi, NewSpaz, Pyromanus, Shadow, Ax Man (Axie), Disguise, Electric, Beauman, Spaztic, Veggieman, others
Overall skill: High
Player activeness: Medium
Clan activeness: Very low
New member strictness: Medium / low
Has lots of great players, but some of the best ones rarely play.

MT - Monkey-E Team (I remember it being called Mighty Turtles at one point though)
Active members: R3ptile, SkulL, some other people who I forgot
All members: R3ptile, SkulL, some other people who I forgot
Overall skill: High
Player activeness: Medium
Clan activeness: Medium / high
New member strictness: Unknown
Has some good players, mostly from Israel. Does clanwars. Periodically dies and comes back.

CC - Cracco Clan
Active members: Too many to list (too lazy, rather)
All members: Too many to list (too lazy, rather)
Overall skill: High
Player activeness: High
Clan activeness: Medium / low
New member strictness: Medium / low
Probably the biggest clan on JJ2. They have some sort of alliance with XSD.. I'm not sure how it works, though, really.

XSD - X-Treme something somethings
Active members: Too many to list (too lazy, rather)
All members: Too many to list (too lazy, rather)
Overall skill: Medium / high
Player activeness: Very high
Clan activeness: High
New member strictness: Low
A pretty good clan with lots of members. Very active.

RF - Something somethings
Active members: Snooz, some others who I can't think of
All members: Snooz, some others who I can't think of
Overall skill: Unknown
Player activeness: Unknown
Clan activeness: Unknown
New member strictness: Unknown
A very new clan. I don't know much about them.

SI - Yes
Active members: BlurredD (Blur), Scizor CT (Sciz CT), Blackraptor (Blacky), URJazz
All members: BlurredD, Scizor CT, Blackraptor, URJazz, Darthmaul
Overall skill: High / very high
Player activeness: Very high
Clan activeness: Very low
New member strictness: Very high
A great clan with a limited number of members. I don't reccomend trying to join, though. It's hard to get in.

FE - Final Existence
Active members: Optic (Ninja), Nimrod
All members: Optic, Nimrod
Overall skill: Medium
Player activeness: Medium
Clan activeness: Very low
New member strictness: Very low
This clan isn't really a JJ2 clan. It's mostly a UT clan. If you want to get in, Nimrod will probably let you.

THE END.