Numerous databases are online that offer this information. We like using the free look-up included in the suite of free lookup databases from Melissa Data.
The Melissa Data service is powered by IP2Location that also offers a free service (max. 20 lookups per day). More for a fee.
Caveat: As you know, these databases are not always 100% accurate. For example, a user might be using an address that is not tied to the specific location where the person is located. Nevertheless, they can sometimes help.
Other Sources include:
+ MaxMind GeoIP Demo also available via SEOMoz
+ GeoBytes
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