[mbag]

Or switch to Visual Line mode (<shift>+v) to select desired lines and you don't need to count how many lines to delete/yank.

Another useful visual mode is Visual Block (<ctrl>+v), for deleting/yanking, replacing block across multiple lines.

[tgb]

That's exactly what jimmaswell suggested he didn't like, though.

[mbag]

I see, I thought he had problem with counting line numbers to delete :)