Since i now own an iPhone 4s , and jailbreak for iPhone 4s is still not sure about .As many people here are using iPad 2 , iPhone 4 etc which are either on iOS 5 or they don't want to jailbreak
The biggest advantage of jailbreak on iDevices is ability to install "crack" apps and 3rd party apps .But not anymore , you don't need to jailbreak to be able to install apps without app store
The process isn't free , but its worth money spent and is not that huge of amount
Process involves getting your UDID ( device hardware id used for development purposes) to be registered with apple developing accounts and using dev certificates and profiles
There are several developers on net who sell these services for 9.99$ -15$
they provide u with dev certificate and register your UDID with apple developer accounts
All u need is a mac and just install certificate and use ire sign to sign apps u downloaded and sync it with iTunes
it basically tricks phone security into thinking that u are testing the application as a developer
http://uhelios.com/
this developer i have dealt with personally and his services are at 9.99$
for windows users u have 2 options
- install vmware and install and use mac os to use i resign
-or sign up for xappsx service , which allows u to directly download apps from www.xappsx.com from your iPhone/ipod/ipad and install on ur device . xappsx is site similar to apptrackr for people who pay can directly download apps and install on their devices without need of using ire sign , but that costs 20$
http://shopios.com/
i have dealt with these guys also and they are very legit offering service for windows as well as mac users
for 10$ its worth every penny having to no more worry about iOS updates or ability to loose jailbreak
Currently i have iOS 5.01 on my iPhone 4s and i use macbook pro to sign my apps i download from apptrackr
it works perfectly , no need to wait for jailbreak anymore . This method works irrespective of your iOS VERSION
There are some who can do it for 4-6$ also , but i don't know if they are genuine
In my case i bought my package for 10$ . I couldn't get it to work initially , i contacted developer he tried to change certain certificate settings on my macbook , but even he gave up after trying 2-3 times , stating that my macbook has some issues , LOL , i kept playing with it alone and boom it started working .It was just minor issue of mis spelling in one of lines .....
P.S- Plz pay developers for their apps , some apps are well worth every penny , i prefer to pay for apps whenever possible .