I like traffictravis for basic seo needs..easy to track backlinks for my site and some other handy features
i only use yahoo site explorer. i really have no idea why. That's about all i use yahoo for...that and fantasy football.
I have been using Webmaster Tools , backlinkwatch and even Yahoo Site Explorer. Backlinkwatch is much more easier to use and you don't even have to be registered member to check back-links. If you have been using any other back-link check which is much more powerful then this three then i would appreciate that.
for some reason yahoo inlinks doesnt work for me now so i m using backlink watch and traffic travis. i have hard a lot about scrape box will give it a try and will also try MS...
i always prefer yahoo site explores and Google Webmaster for my sites. yahoo displays backlinks more quickly the the google.
I personally use Google Webmaster tools and sometimes the aboutus.org site. Usually are pretty accurate.