Radar is a new mobile photo sharing application - but unlike its rivals, it's designed for sharing among a select group of friends. When you sign up, you get a unique Radar.net email address to send your images to - you can then invite friends to view your pictures and comment on them. You can use Radar on the web, or view the mobile version on your cellphone.
At a time when everyone else is building wide open, publicly viewable photo sharing applications (eg Where.com), Radar's strategy is an interesting one. While there's definitely a demand for less public sharing, these services will surely experience slower growth: if your users aren't posting images from your service, creating blog widgets and offering free promotion on MySpace, it's more difficult to build your userbase. Yes, new users will be referred by their friends, but that seems much less efficient than web-based viral marketing ala Flickr and YouTube.
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