Active Eagle – Keep your Yahoo Fire Eagle account updated by using this app to send your location via the iPhone’s GPS.

Bliin – A social network that allows you to constantly update your location so other members can see where you are depending on what privacy level you have set.  Has all the other usual trappings of a social network such as messages, groups and so on.

Brightkite – Keep your friends updated on where you currently are, and keep them abreast of what you’re doing.

byNotes – byNotes allows you to message your friends and let them know where you are.

CityWatch – Explore the area around you by looking at geotagged photos on Flickr and Zannel, add your own, message with people around you and more.

iCloseBy WiFi – A location-based way of meeting people based on their access to the same WiFi hotspot that you are using.  Is also cross platform so you can meet people on laptops and other WiFi enabled devices.

Limbo – See where your friends are and what they are doing, transmit your own activities, look up where to go next and more.  Features support for 200 countries.

Loopt – A location-based social network that works across over 100 mobile devices and can share updates with sites like Facebook and Twitter.

MarcoPolo – See how far away your Facebook friends are, get directions to drive to them and more.

Moximity – Moximity integrates with your Facebook and Twitter friends to see where they last checked in, and if it is anywhere close to you.

Nicado Locate – Updates your profile on Nicado with your current location.

nrme – A location-based social network that functions somewhat like Twitter.  You can set for how far away from you you want it to collect messages.

Puppyo! – A location-based message board service that allows you to talk to people from anywhere on Earth, or you can filter it down to just those in your general vicinity.

Spidr – Spidr gives you the ability to connect to various local “webs” to talk with other “spidrs” that are near you.  If there is no web for your area, you create one, and other users will be able to find you automatically.

Twinkle – A location aware social network for the iPhone and iPod Touch that is also capable of updating your Twitter account.  You can update where you are, send pictures, chat with nearby people and more.

Whos Here – Whos Here allows you to set up a profile, indicate the type of person you want to meet by age and gender, and it will show you the people nearby that meet that criteria.  Instant messaging inside of the application does not use any texting credits.

Whrrl – See which of your friends is around your current location, get suggestions on places to go and even filter down to the types of places that interest you.