Everyone running Kara tonight should watch this in case we decide to give it a try again - although it seems pretty chaotic there actually is a way to keep it under some control.
The only potentially inaccurate portion of the video is the part about Tinhead and his rust effect - I've done some researching on this and found a lot of conflicting info.
What appears to be the most likely way that Rust works is the one presented in wowwiki - 30 seconds after Dorothy becomes active he gets the first Rust debuff, and then he gets another every 6 seconds thereafter, up to a max of 8.
Someone posted a log of Tinman's Rust effects and all frost damage on him:
3/7 22:31:34.218 Eremite's Ice Lance hits Tinhead for 289 Frost damage.
3/7 22:31:36.693 Eremite's Ice Lance crits Tinhead for 510 Frost damage.
3/7 22:31:37.649 Tinhead gains Rust.
3/7 22:31:44.181 Tinhead gains Rust (2).
3/7 22:31:50.149 Tinhead gains Rust (3).
3/7 22:31:56.211 Tinhead gains Rust (4).
3/7 22:31:57.104 Eremite's Ice Lance hits Tinhead for 290 Frost damage.
3/7 22:32:02.226 Tinhead gains Rust (5).
3/7 22:32:08.397 Tinhead gains Rust (6).
3/7 22:32:11.389 Eremite's Ice Lance hits Tinhead for 287 Frost damage.
3/7 22:32:14.741 Tinhead gains Rust (7).
3/7 22:32:20.834 Tinhead gains Rust (8).
3/7 22:32:28.009 Eremite's Ice Lance crits Tinhead for 509 Frost damage.
as you can see, there's no real correlation between Frost damage and his first debuff, and he gains another Rust every 6 seconds.
edit:
LOL - guess it would help if I actually posted the video.
http://www.youtube.com/watch?v=Ah33gVk0SP4