Cesare Rocchi has written up this overview of crash reporting tools from Crashlytics, Crittercism, Bugsense, TestFlight and HockeyApp. I use HockeyApp for our crash reporting and it does a great job at it but reading this article I particularly liked the sound of the Crittercism feature of integrating analytics with crash reporting so that alongside the crash report you can see a breadcrumb trail of analytics information collected along the way. Useful.
Simon Wolf with a detailed write up of configuring your project to produce alpha, beta and App Store binaries which can all be installed alongside each other on device. Like Simon, the first I heard of this technique was from Evan Doll at NSConference this year but if you had been delaying implementing it Simon's write up might get you headed in the right direction.