Actually the domain registrar website is good enough to find your liked domains. Just enter your interested domain names and search then it will give out a suggested list. godaddy is such.
That is not what I mean. I am looking for the best tool to find as well available domain names and dropped domain names with information about registration date, drop date, automatic bidding options and alerts, and more info about for example links to the site, PR, Traffic, history of domain etcetera.
DomainsBot is good. But dont always trust it. Many times the results are cached and few days old... seemd like a month old data sometimes.