I use the SEO Quake toolbar. Is simply the best. Just on a click of a button, it can give you the
No Of Backlinks(Acc to Yahoo & Google)
Indexed Pages (Google, Yahoo & Bing)
BAcklinks for the whole Domain
Age of Domain, etc.,etc..
Looks like this :
Sorry for the 'paint' screw-up here
The Secret Definitive Guide To Finding Tons of PR4-PR8 Backlinks with ease <== Boost Your Website Rankings Overnight
I use the SEO for Firefox plugin..it works with Google search results..unlike SEO Quake which works as a firefox tab..
SEO Spyglass free version is what I use.