Lately we've been looking at geolocation stuff as well. Adside from MaxMind, we contacted IP2Location and Quova (never heard back from Quova). We are not in th

Lately we've been looking at geolocation stuff as well. Adside from MaxMind, we contacted IP2Location and Quova (never heard back from Quova). We are not in the US and were looking for a service that could provide geolocation to a more detailed level than city, preferably postcodes. We have not found a service that could do this for us as accurately as we were hoping. But if you're in the US and/or just looking to resolve IPs to cities, then both IP2Location and MaxMind seem like they'd be worth looking into. Both companies were quite responsive to email contact.