I'm rarely bothered by on-screen idents. In fact, I quite like some of them (the BBC's in particular) and am disappointed that other channels didn't keep theirs (like Channel 4, who experimented with them for a while on late-night programming). But some are just eyesores. Like the National Geographic Channel (the yellow window should be enough!) and CNBC Europe (it takes up about 5% of the screen space, far too big). Thankfully we're not plagued by the animated ones over here; only music stations and kids channels use them, to my knowledge.