Hello,

Aaron Walls "SEO for Firefox" extension is worth a look not only for optimizers but also for other users. It allows you to circumvent bad apples in search results buy displaying almost all authority data there is about a website: PageRank, domain age, inbound links, del.icio.us bookmarks and so on.

I wonder if you too think it's useful.

Note: As to now it only works with the .com variants of Google and Yahoo.

http://www.seobook.com/archives/001741.shtml