Here's a look at American Idols on the album chart (and a couple that have fallen off), courtesy Nielsen SoundScan:
Number-one last week: Dreamgirls featuring Jennifer Hudson (66,000, down 36% from the previous week; 452,000 total): Of course not technically a J-Hud (wow, hope that doesn't catch on) album, but she deserves to share in the credit.
Number-19: Carrie Underwood (39,000 sold; down 41%; 5 million total)
Number-47: Taylor Hicks (19,000 sold; down 51%; 559,000 total): Everybody was down, but Taylor dropped significantly.
Number-66: Fantasia (14,000 sold; down 37%; 231,000): Essentially held its own considering the general downtrend, and the single's still alive, but it's a long way from gold.
Number-83: Kellie Pickler (10,600 sold: down 36%; 363,000): Also holding its own. Three months to 500,000 at this pace.
Katharine McPhee: No. 3 on the singles chart with a staggering 600 copies; total 158,000.