In case you weren't paying attention last week - Karsten Nohl and friends cracked the GPRS encryption scheme.
In this Forbes interview with Karsten the interviewer tried to get an answer on why the encryption scheme for GPRS was made weaker than that of the earlier GSM voice encryption scheme (A5/1 - which demanded much more effort to crack).
One point I didn't see mentioned is that fact that data communicated over GPRS can easily be encrypted at the application level, while voice is generally only secured at the GSM level. No serious security engineer would rely on the unkown propriety GPRS encryption for securing sensitive data communications over GPRS when they can always add there own application level encryption. If you know of a system that does rely on the GPRS encryption for such data - please leave a note in the comments below.