General Motors entered bankruptcy and..
Sold: Hummer (to Sichuan Tengzhong Heavy Industry Machine Co), and Saab (to Spyker Cars N.V.)
Discontinued: Pontiac and Saturn

Chrysler entered bankruptcy.

Ford did not enter bankruptcy, but…
Sold: Aston Martin, Land Rover, Jaguar, and Mazda.

The only brand showing positive sales growth (for which stats were available) from 2005 to 2008 was Mazda, with a +0.5% CAGR. Cash for Clunkers clearly had a fleeting impact on sales, essentially shoring up some demand at the expense of near-future sales.

The two best selling domestic vehicles are Ford F-150 (#1), and Chevy Silverado (#4). The remaining top 5 are Japanese mid-size or compact sedans.

The Total U.S. Light Vehicle Sales chart shows that domestic brands visibly lost market share to all other brands over the past decade.