I'm a fan of writing your own; it isn't very hard (just send back some data in appWillTerminate: and a quick ruby/perl/python/cgi/whahtever script to parse it into results) and it lets you keep track of information like the OS or device type that your users are running. Flurry and the like can no longer collect this data for you due to a change in Apple's dev agreement. Although, with your app, this might not be terribly important information.
I use appFigures.
I don't think AppFigures qualifies. What I'm looking for is a tool that detects intra-day traffic spikes. Both AppFigures & Google Analytics arrive one day late at the party.
Localytics is close to real time. I track my launches with it and can see the spikes from certain big blogs to be clearly visible.
"Flurry Analytics provides accurate, real time data to developers about how consumers use their mobile applications, as well as how applications are performing across different handsets. Application developers receive aggregated usage and performance data, as well as robust reporting and analysis tools. With this data, developers can identify issues and opportunities, create a more informed product roadmap, increase retention and grow their user base."