The most important part of jb for me is the ability to run an host based firewall, and have per application rules.
I use FirewallIP on iOS 5, I hope it works on iOS 6.
I block hundreds of ad and tracking servers as global policy.
This functionality doesnt exist on android... I've yet to find anything except moxies firmware for the nexus (now MIA) that has this.
Sorry late response... One is WiFi Analyzer. Shows Channel, strength, encryption, ssid. Has a nice little great with signal strength along with min/max/avg. Not sure if you can get it from appstore now as someone else pointed out can get OpenVPN officially there now :)
Also... I'm curious as to why Apple hasn't added a SBSettings / NCSettings type feature as most other smartphones have toggle buttons in the "notification area" which make life a lot easier.