Market Samuri and Traffic Travis are among my favourites.

But I don't spend too much time tracking already created backlinks, I just build more

I use seo spyglass to check my competitors backlinks, I dont worry about my backlinks to much. I generally use site explorer if I want to check my own backlinks, its easy and only takes a few seconds.

I just go to Yahoo and do the link command...

I use backlinkwatch.com

I always use yahoo to check backlinks.