I wonder what a chart would look like if it graphed what percent of 75s are raiding each expansion.
Hmm... actually...
http://www.lavanet.no/progress/ tracks 268 guild, of which:
TSS: 33 (12%) are raiding TSS; 10 (4%) have killed all; 10 (4%) shown as making progress since 1 Dec 06
PoR: 43 (17%) have taken out Daosheen but not Ayonae Ro; 8 (3%) shown as making progress since 1 Dec 06
DoD: 88 (33%) have taken out Sendaii but not Mayong; 10 (4%) shown as making progress since 1 Dec 06
DoN: 10 (4%) have taken out Tirranum but not Vishimtar; 9 (3%) shown as making progress since 1 Dec 06
OoW: 22 (8%) have entered Anguish, but not beaten Jelvan; 8 (3%) shown as making progress since 1 Dec 06
GoD: 92 (34%) are flagged for Kod'Taz, but not Tacvi; 6 (2%) shown as making progress since 1 Dec 06
As some guilds are progressing in multiple expansions, there are more than 268 results.
Wow. More guilds currently trying to progress through GoD than any other expansion.
Actually, it's probably more accurate to say that more guilds have reportedly started but not finished GoD than any other expansion.