You can run apt-cache showpgk com.ericasadun.utilities in mobileterminal and get a list of everything that depends on it. I'm not real familiar with apt, I assume it only shows dependencies for repos you have installed.
# apt-cache showpgk com.ericasadun.utilities
Package:*com.ericasadun.utilities
Versions:*
beta17*(/var/lib/apt/lists/apt.modmyi.com_dists_stable_main_binary-iphoneos-arm_Packages)*(/var/lib/dpkg/status)
*Description*Language:*
*****************File:*/var/lib/apt/lists/apt.modmyi.com_dists_stable_main_binary-iphoneos-arm_Packages
******************MD5:*987de773f8485b6d58ae2f61b5f12133
Reverse*Depends:*
**net.r-ch.fcsb,com.ericasadun.utilities
**com.beyoip.packagebackup,com.ericasadun.utilities
**com.beyoip.appiconreorder,com.ericasadun.utilities
**com.beyoip.appcrack,com.ericasadun.utilities
**sbsettingsultrasn0w,com.ericasadun.utilities
**net.ichi2.ankimini,com.ericasadun.utilities
**com.rafael.findinpage,com.ericasadun.utilities
**com.pragmatixconsulting.packagebackup,com.ericasadun.utilities
**com.pragmatixconsulting.appiconreorder,com.ericasadun.utilities
**com.liv2.cellulardata,com.ericasadun.utilities
**com.bossprefs.autolock,com.ericasadun.utilities
**com.bigboss.ultra.bossprefs,com.ericasadun.utilities
**bigbosshackertools,com.ericasadun.utilities
Dependencies:*
beta17*-*
Provides:*
beta17*-*
Reverse*Provides:*