Name Stalker 1.0 for Windows, Macintosh, Mac OS X was released on

Name Stalker is a neat little utility that allows you to monitor domains
you own (or domains you want to capture). Name Stalker is multi-threaded,
so you can perform concurrent lookups (you can even set the number of
threads to use as a preference).

A *FREE*, 100% working copy can be downloaded from:

Some of the major improvements over the beta versions are support for new
domain extensions (.info, .name, .biz, etc.), ability to export domains,
reporting capability, ability to set timeout for whois queries, and some
other miscellaneous stuff…