thanks for the list, yahoo site explorer works best for me, and I suggested it for some people here .
Another vote for Yahoo Site Explorer. I was trained using it and it's always been a comfortable source for me.
I use SEo book plugin in firefox, but this uses yahoo site explorer. When i was checking links for <a href="http://www.bedsandmattressuk.co.uk">Beds</a> site it would suggest i had 100 links but then site explorer was always showing less.
I use Open Site Explorer through the SEOMoz toolbar for Chrome/Firefox. I'd recommend SEOMoz pro membership for any medium/large SEO firm. (I used to work at one)