Covers I don't much care for include when boybands or people who have just won Pop Idol or something, cover an old, great song for their first single, get to number 1, and don't do crap but stand there and look pretty while having an ok voice. Especially when that's 90% of what they ever release. Stop stealing!

Covers I do like, are when good bands with plenty of original stuff, do their *own* take on another band's song. I love the Live Lounge on Radio 1 for that. Examples include:

Arctic Monkeys - Love Machine (Girls Aloud)
It was really funny hearing them sing this in their own way, and when they laugh in the middle of it. I prefer their version over Girls Aloud, and it was the top of my LastFM chart for a good while (now 2nd).

The Boy Least Likely To - Faith
This song is SO cute. They just completely make it the boy least likely to. The way the little things kick in, and the gentle, softness and cuteness. It is a lovely cover. They played it live and the crowd loved it. <3

We Are Scientists - Hoppipolla
It's great to hear a band doing a really different style to their usual stuff. WAS are really diverse, their new EP and their old tracks show that.

That's just a few, but there are more good ones.