CallMe is a jailbreak app that adds contacts directly to your iPhone springboard allowing you to call/text them in just one tap. After installing the application, you can launch it and choose the contacts you want to add to the home screen. If the contact has several numbers tied to him, you can choose which one you want to use, and whether you want to use it for call or SMS.
Contacts added to the home screen can be put into folders. Pretty convenient!
CallMe is available in Cydia for free. You will have to add the following repo: http://ispaziorepository.com.
If you try CallMe, please let us know what you think of it.